Swap steps 1 and 3 in CreateEnvelopeWizardPopup

Reorganize the wizard steps to prioritize "Receivers" (step 1)
before "Message and Options" (step 3). Update `_currentStep`
logic, conditional checks, and validation to reflect the new
step order. Adjust `GetStepTitle` and `GetStepDescription`
methods to align with the updated step titles and descriptions.
Ensure user input handling and step-skipping behavior are
consistent with the new flow.

.gitignore

@@ -370,3 +370,4 @@ FodyWeavers.xsd
 /EnvelopeGenerator.Server/EnvelopeGenerator.Server/publish-output
 /EnvelopeGenerator.Server/EnvelopeGenerator.Server/tekh_softHSM_test.md
 /ignore/EnvelopeGenerator.Form
+/EnvelopeGenerator.Server/EnvelopeGenerator.Server/appsettings.Secrets.json

AGENTS.md

@@ -48,6 +48,16 @@ This section explains every markdown file in the repo: what it contains, why it
 - Implementing sender-side PDF.js overlay (signature field placement) — the receiver side is the reference implementation
 **Maintenance:** Update when `pdf-viewer.js` API changes, new JS interop functions are added, or the signing flow is modified.
 
+#### `DATABASE_STRUCTURE_CONTEXT.md`
+**What:** Deep DB documentation for the envelope domain. Includes table/column snapshot, entity-to-table mapping, EF relationship/constraint map, stored procedure behavior + call sites, and trigger behavior + wiring path.
+**Why it exists:** DB is centralized and can evolve independently; this file preserves migration-critical data semantics when historical DB context is hard to recover.
+**When you need it:**
+- Planning or reviewing DB/schema changes
+- Debugging status transitions/history side effects
+- Tracing where `PRSIG_*` procedures or DB triggers affect app behavior
+- Reconciling Domain entities with physical SQL schema
+**Maintenance:** Refresh on each DB migration, trigger/procedure change, or significant Domain/EGDbContext model change.
+
 ---
 
 ### Deployment Docs
@@ -63,6 +73,36 @@ This section explains every markdown file in the repo: what it contains, why it
 
 ---
 
+## Markdown Audit Snapshot (2026-10-05)
+
+The following table summarizes repository markdown files by practical status: completed, partially complete, or removable candidates.
+
+| File | Type | Status | Missing / Gap | Removal Recommendation |
+|---|---|---|---|---|
+| `AGENTS.md` | Agent onboarding | Partially complete | Route/migration statements can drift from real code over time. | Keep |
+| `COPILOT_CONTEXT.md` | Architecture reference | Partially complete | Some route/render details may be out of sync with other docs; needs regular reconciliation. | Keep |
+| `FORM_APPLICATION_CONTEXT.md` | Legacy-to-modern feature spec | Partially complete | Large sections still marked not implemented / needs implementation. | Keep |
+| `RECEIVER_PDF_VIEWER_CONTEXT.md` | Receiver PDF viewer deep-dive | Partially complete | Long migration plan needs periodic sync with active implementation. | Keep |
+| `SENDER_SAVE_EDIT_MIGRATION_PLAN.md` | Sender workflow implementation plan | Partially complete | No explicit implementation progress markers per phase. | Keep (until migration closes) |
+| `SENDER_PDF_TOOLBAR_PLAN_EN.md` | Sender PDF toolbar plan | Incomplete | Explicit pending item remains (`Toolbar visual polish`). | Keep (until done) |
+| `SENDER_EDITOR_WASM_PDF_EDITOR_IMPLEMENTATION_PLAN_en.md` | Sender editor WASM migration plan | Incomplete | Plan exists but completion/progress tracking is minimal. | Keep (until done) |
+| `EnvelopeGenerator.Server/EnvelopeGenerator.Server/README.md` | Deployment guide | Complete (operational) | No critical gap identified. | Keep |
+| `envelope-generator-ui/README.md` | Angular scaffold README | Complete but generic | Template text only; low project-specific value. | Removable or replace with project-specific summary |
+| `EnvelopeGenerator.Web/wwwroot/lib/typed.js@2.1.0/README.md` | Third-party vendor README | Complete (vendor) | Not project workflow documentation. | Keep with vendor assets |
+| `EnvelopeGenerator.Web/wwwroot/lib/jquery-validation/LICENSE.md` | Third-party license | Complete (legal) | No gap. | Keep |
+| `EnvelopeGenerator.Server/EnvelopeGenerator.Server/wwwroot/css/open-iconic/README.md` | Third-party vendor README | Complete (vendor) | Not project-specific guidance. | Keep with vendor assets |
+| `ignore/EnvelopeGenerator/EnvelopeGenerator.Web/wwwroot/README.md` | Legacy PSPDFKit note | Outdated | Mentions deprecated PSPDFKit-based flow; may mislead if reused. | Removable/archive |
+| `ignore/EnvelopeGenerator/EnvelopeGenerator.Web/wwwroot/lib/typed.js@2.1.0/README.md` | Duplicate vendor README | Redundant | Duplicate copy under `ignore/`. | Removable/archive |
+| `ignore/EnvelopeGenerator/EnvelopeGenerator.Web/wwwroot/lib/bootstrap-icons/README.md` | Vendor README in archive area | Secondary | Archive-only utility, not active docs. | Removable/archive |
+| `ignore/EnvelopeGenerator/EnvelopeGenerator.Web/wwwroot/lib/jquery-validation/LICENSE.md` | Duplicate license in archive area | Redundant | Duplicate copy under `ignore/`. | Removable/archive (if legal policy allows) |
+| `ignore/EnvelopeGenerator/EnvelopeGenerator.GeneratorAPI/ClientApp/envelope-generator-ui/README.md` | Duplicate Angular scaffold README | Redundant | Generic template + duplicate in archive path. | Removable/archive |
+
+### Documentation Audit TODO
+
+- [ ] Validate this markdown audit table against the current codebase and update statuses (`complete`, `partial`, `incomplete`, `removable`) when implementation changes land.
+
+---
+
 ## Active Architecture (Post-Migration)
 
 **Frontend:** Blazor Auto (Server+WASM hybrid)
@@ -238,9 +278,21 @@ Manual testing workflow:
 
 ## Technical Debt TODOs
 
+- **CRITICAL (Licensing / pre-commercial release):** Remove all `SixLabors.ImageSharp` and `QRCoder-ImageSharp` package dependencies from production/runtime projects before commercial release. Replace remaining QR/image paths with permissive-license alternatives (no copyleft/share-source obligations), run repo-wide package audit (`*.csproj`), and add CI guardrails to block reintroduction.
 - Refactor `EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeSenderPage.razor` to reduce complexity.
 - Move sender dashboard business/status logic into dedicated services and extension methods (for example effective status resolution, tab classification, receiver signed/rejected detection, and grid-layout filter sanitation).
 - Keep `EnvelopeSenderPage.razor` focused on UI composition/state orchestration; avoid embedding heavy domain logic directly in the Razor component.
+- Apply a modular page architecture across Server pages (starting with `EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeSenderPage.razor`): split large pages into smaller subcomponents/partial modules, eliminate duplicated code paths, and centralize shared UI/domain logic for maintainability.
+- Perform a senior-level page performance review across sender/receiver flows before further UX changes: verify route transitions, component mount/unmount behavior, loading-state correctness, duplicate API calls, and perceived latency (first meaningful paint and return-navigation responsiveness). Treat loading logic defects as architecture/performance issues first, not styling problems.
+- Audit `EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Services/` for unnecessary request/payload remapping and remove redundant mappings where direct request DTO usage is safe; review client HTTP methods end-to-end for similar avoidable transformation layers.
+- Centralize dependency injection registrations into dedicated extension methods/modules (especially server + client service registrations in `Program.cs`) to reduce startup composition sprawl and improve maintainability.
+- Refactor `EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/PdfRenderController.cs` + matching client service contract to remove JSON/base64 `byte[]` transport for PDF rendering; prefer binary streaming (`application/octet-stream` or multipart), avoid `data:` URL bloat where possible, and validate end-to-end memory/latency behavior with large PDFs.
+- Establish a DevExpress toast-based notification architecture using `DxToastProvider` + `IToastNotificationService` (tab/page-scoped provider strategy, standardized `ToastOptions` factory, and severity-to-style mapping) so sender/receiver flows show consistent, non-duplicated, actionable feedback.
+- Eliminate manual property-by-property request→domain mapping drift (example: `CreateEnvelopeCommandHandler`) by introducing a standardized mapping policy (AutoMapper/profile conventions or reflection/source-generator based mapper) and enforcing it across envelope workflows; this needs to be solved in the shared company Core library level so all services get the same guardrails by default.
+- P1 security workstream: remove dynamic SQL string composition/interpolation from active save/create/update paths (`string.Format`, `$"...{input}..."`, `ToSqlParam`) and migrate to parameterized queries only; treat this as a potential SQL injection vulnerability (stability + security risk), execute repo-wide audit, and add CI guardrails to block reintroduction.
+- Alternative UX design (Server component): in `EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeSenderPage.razor`, enforce deterministic row double-click behavior as exactly one action (preview OR edit), and keep row action buttons/tooltips aligned with the same rule to eliminate ambiguous navigation.
+- Implement SPA-style language switching so the UI culture updates immediately without a full page reload.
+- Implement sender-scoped caching for "recent receiver suggestions" used during envelope creation (wizard/editor flows): cache key should include sender identity, support short TTL + invalidation hooks after successful envelope receiver writes, and prevent cross-sender suggestion leakage.
 
 ## Database
 
@@ -252,11 +304,51 @@ Manual testing workflow:
 **Key Tables:**
 - `TBSIG_ENVELOPE` - Envelope metadata
 - `TBSIG_ENVELOPE_RECEIVER` - Receiver assignments
-- `TBSIG_DOC_RECEIVER_ELEMENT` - Signature fields (X, Y in INCHES)
+- `TBSIG_DOCUMENT_RECEIVER_ELEMENT` - Signature fields (X, Y in INCHES)
 - `TBSIG_RECEIVER` - Receiver registry
-- `TBSIG_DOCUMENT` - PDF binary data
+- `TBSIG_ENVELOPE_DOCUMENT` - PDF binary data
 - `TBSIG_ENVELOPE_HISTORY` - Audit trail
 
+### Data Structure (Domain + EGDbContext)
+
+Use this as the canonical quick map before touching sender/receiver workflow code.
+
+#### Core Aggregate Shape
+- `Envelope` (`TBSIG_ENVELOPE`) is the root aggregate for sending workflow.
+- `Envelope -> Documents` is `1:N` via `Document.EnvelopeId` (`TBSIG_ENVELOPE_DOCUMENT`).
+- `Envelope -> Histories` is `1:N` via `History.EnvelopeId` (`TBSIG_ENVELOPE_HISTORY`).
+- `Envelope <-> Receiver` is `N:N` through `EnvelopeReceiver` (`TBSIG_ENVELOPE_RECEIVER`, composite PK `{EnvelopeId, ReceiverId}`).
+- `Document -> DocReceiverElement` is `1:N` via `DocReceiverElement.DocumentId` (`TBSIG_DOCUMENT_RECEIVER_ELEMENT`).
+- `DocReceiverElement -> ElementAnnotation` is `1:N` via `ElementAnnotation.ElementId` (`TBSIG_DOCUMENT_RECEIVER_ELEMENT_ANNOTATION`).
+
+#### Status and Tracking Entities
+- `DocumentStatus` (`TBSIG_DOCUMENT_STATUS`) links `EnvelopeId + ReceiverId` and stores receiver-level signing state.
+- `History` stores timeline events (`EnvelopeStatus`) with polymorphic `UserReference` lookup semantics.
+- `EnvelopeReceiverReadOnly` (`TBSIG_ENVELOPE_RECEIVER_READ_ONLY`) stores temporary read-only delegation with validity window (`DateValid`).
+
+#### Important Constraints From `EGDbContext`
+- `Envelope.Uuid` has a unique index.
+- `Receiver.Signature` has a unique index.
+- `Receiver.EmailAddress` has a unique index.
+- `EnvelopeReceiver` uses composite primary key: `{ EnvelopeId, ReceiverId }`.
+- `History.UserReference` is mapped conditionally (`IsMigration == false`) to:
+  - `Receiver.EmailAddress` (`History.Receiver`)
+  - `User.Email` from UserManager (`History.Sender`)
+- `EnvelopeReceiverReadOnly.AddedWho` maps to `Receiver.EmailAddress` (principal key mapping, not receiver GUID).
+
+#### Coordinate-Critical Fields
+- Signature placement is persisted in `DocReceiverElement` as `X`, `Y`, `Width`, `Height`, `Page`.
+- These coordinates are in INCHES (not PDF points, not pixels).
+
+#### Cross-Module Tables in Same Context
+- `EGDbContext` also includes UserManager entities: `User`, `Group`, `Module`, `GroupOfUser`, `ModuleOfUser`, `UserRep`, and `ClientUser`.
+- Mail dispatcher entity `EmailOut` is also registered under `#if NET` and trigger-configurable.
+
+#### Trigger-Aware Model Notes
+- Trigger names are injected from `DbTriggerParams` in appsettings and applied via `ToTable(tb => tb.HasTrigger(...))`.
+- Current trigger registration is explicit (`AddTrigger<T>()` calls), not attribute/reflection driven.
+- Do not remove trigger mappings casually; this project depends on DB-side automation/audit behavior.
+
 ## DevExpress
 
 **License:** Commercial (v25.2.3)

DATABASE_STRUCTURE_CONTEXT.md

@@ -0,0 +1,384 @@
+# Database Structure Context
+
+## Why this file exists
+
+This is the deep-dive DB reference for migration work when schema can change and old DB knowledge may be lost.
+
+- Scope: `EnvelopeGenerator.Domain` entities + `EnvelopeGenerator.Infrastructure/EGDbContext.cs` + live DB metadata snapshot from `DD_ECM`.
+- Goal: make schema transitions predictable (what exists, how it is linked, where logic executes).
+- Safety: all DB checks used read-only `SELECT` metadata queries; no data mutation.
+
+## Snapshot metadata
+
+- Source DB: `DD_ECM` on `SDD-VHP04-SQL19\DD_TESTING01`
+- Snapshot date: `2026-10-20`
+- App context: `EnvelopeGenerator.Infrastructure/EGDbContext.cs`
+
+## Fast navigation
+
+- High-level aggregate map: `AGENTS.md` -> `Database` section
+- EF model config source: `EnvelopeGenerator.Infrastructure/EGDbContext.cs`
+- Stored procedure wrappers:
+  - `EnvelopeGenerator.Application/Common/SQL/EnvelopeCreateReadSQL.cs`
+  - `EnvelopeGenerator.Application/Common/SQL/EnvelopeReceiverAddReadSQL.cs`
+  - `EnvelopeGenerator.Application/Common/SQL/DocumentCreateReadSQL.cs`
+- Direct SQL execution in controller:
+  - `EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/EnvelopeReceiverController.cs`
+
+## Core data model (ER-level)
+
+- `Envelope` (`TBSIG_ENVELOPE`) is root aggregate.
+- `Envelope (1) -> (N) Document` via `TBSIG_ENVELOPE_DOCUMENT.ENVELOPE_ID`.
+- `Envelope (1) -> (N) History` via `TBSIG_ENVELOPE_HISTORY.ENVELOPE_ID`.
+- `Envelope (N) <-> (N) Receiver` through `EnvelopeReceiver` (`TBSIG_ENVELOPE_RECEIVER`, composite PK `{ENVELOPE_ID, RECEIVER_ID}`).
+- `Document (1) -> (N) DocReceiverElement` via `TBSIG_DOCUMENT_RECEIVER_ELEMENT.DOCUMENT_ID`.
+- `DocReceiverElement (1) -> (N) ElementAnnotation` via `TBSIG_DOCUMENT_RECEIVER_ELEMENT_ANNOTATION.ELEMENT_ID`.
+- `DocumentStatus` links `Envelope + Receiver` state in `TBSIG_DOCUMENT_STATUS`.
+
+## Entity <-> table mapping (code-level)
+
+| Entity | Table | PK in code | PK in DB | Important relation notes |
+|---|---|---|---|---|
+| `Envelope` | `TBSIG_ENVELOPE` | `Id` | `GUID` | Has `Documents`, `Histories`, `EnvelopeReceivers`; unique index on `Uuid` configured in EF |
+| `EnvelopeReceiver` | `TBSIG_ENVELOPE_RECEIVER` | `{EnvelopeId, ReceiverId}` | `{ENVELOPE_ID, RECEIVER_ID}` | DB also has `GUID` identity (not modeled as entity PK) |
+| `Document` | `TBSIG_ENVELOPE_DOCUMENT` | `Id` | `GUID` | FK `ENVELOPE_ID` |
+| `DocReceiverElement` | `TBSIG_DOCUMENT_RECEIVER_ELEMENT` | `Id` | `GUID` | Coordinates persisted here (`POSITION_X/Y`, `WIDTH`, `HEIGHT`, `PAGE`) |
+| `ElementAnnotation` | `TBSIG_DOCUMENT_RECEIVER_ELEMENT_ANNOTATION` | `Id` | `GUID` | FK `ELEMENT_ID` |
+| `DocumentStatus` | `TBSIG_DOCUMENT_STATUS` | `Id` | `GUID` | FK `ENVELOPE_ID`, `RECEIVER_ID` |
+| `History` | `TBSIG_ENVELOPE_HISTORY` | `Id` | `GUID` | `USER_REFERENCE` maps to `Receiver.EmailAddress` and `User.Email` when `IsMigration == false` |
+| `Receiver` | `TBSIG_RECEIVER` | `Id` | `GUID` | Unique indexes in code: `Signature`, `EmailAddress` |
+| `EnvelopeReceiverReadOnly` | `TBSIG_ENVELOPE_RECEIVER_READ_ONLY` | `Id` | `GUID` | `AddedWho` is FK-like mapping to `Receiver.EmailAddress` |
+| `EnvelopeType` | `TBSIG_ENVELOPE_TYPE` | `Id` | `GUID` | Used as optional envelope defaults/template |
+| `EmailTemplate` | `TBSIG_EMAIL_TEMPLATE` | `Id` | `GUID` | Trigger-managed `CHANGED_WHEN` |
+| `EmailOut` (legacy/bridge) | `TBEMLP_EMAIL_OUT` | `Id` | `GUID` | Internal/obsolete domain class, still registered for DB access |
+
+## Physical schema snapshot (table/column level)
+
+Notes:
+- Format per column: `COLUMN_NAME TYPE NULLABLE`.
+- This section reflects live DB metadata at snapshot time.
+
+### `TBSIG_ENVELOPE`
+
+- `GUID int NOT NULL`
+- `USER_ID int NOT NULL`
+- `STATUS int NOT NULL`
+- `ENVELOPE_UUID nvarchar(36) NOT NULL`
+- `MESSAGE nvarchar(max) NOT NULL`
+- `EXPIRES_WHEN datetime NULL`
+- `EXPIRES_WARNING_WHEN datetime NULL`
+- `VERIFICATION_TYPE tinyint NOT NULL`
+- `TITLE nvarchar(128) NULL`
+- `CONTRACT_TYPE int NULL`
+- `LANGUAGE nvarchar(5) NULL`
+- `SEND_REMINDER_EMAILS bit NULL`
+- `FIRST_REMINDER_DAYS int NULL`
+- `REMINDER_INTERVAL_DAYS int NULL`
+- `ENVELOPE_TYPE int NULL`
+- `CERTIFICATION_TYPE int NULL`
+- `USE_ACCESS_CODE bit NULL`
+- `FINAL_EMAIL_TO_CREATOR int NULL`
+- `FINAL_EMAIL_TO_RECEIVERS int NULL`
+- `EXPIRES_WHEN_DAYS int NULL`
+- `EXPIRES_WARNING_WHEN_DAYS int NULL`
+- `TFA_ENABLED bit NOT NULL`
+- `DOC_RESULT varbinary(max) NULL`
+- `LANG_CODE varchar(5) NOT NULL`
+- `SOURCE varchar(10) NOT NULL`
+- `COMMENT varchar(128) NULL`
+- `ADDED_WHEN datetime NOT NULL`
+- `CHANGED_WHEN datetime NULL`
+
+### `TBSIG_ENVELOPE_RECEIVER`
+
+- `ENVELOPE_ID int NOT NULL`
+- `RECEIVER_ID int NOT NULL`
+- `SEQUENCE int NOT NULL`
+- `NAME nvarchar(128) NULL`
+- `JOB_TITLE nvarchar(128) NULL`
+- `COMPANY_NAME nvarchar(128) NULL`
+- `PRIVATE_MESSAGE nvarchar(max) NULL`
+- `ACCESS_CODE nvarchar(64) NULL`
+- `ADDED_WHEN datetime NOT NULL`
+- `CHANGED_WHEN datetime NULL`
+- `GUID bigint NOT NULL`
+- `PHONE_NUMBER varchar(20) NULL`
+- `PARENT_ENVELOPE_RECEIVER_ID int NOT NULL`
+
+### `TBSIG_ENVELOPE_DOCUMENT`
+
+- `GUID int NOT NULL`
+- `ENVELOPE_ID int NOT NULL`
+- `FILENAME nvarchar(256) NOT NULL`
+- `FILEPATH nvarchar(256) NOT NULL`
+- `ADDED_WHEN datetime NOT NULL`
+- `FILENAME_ORIGINAL nvarchar(256) NULL`
+- `BYTE_DATA varbinary(max) NULL`
+
+### `TBSIG_DOCUMENT_RECEIVER_ELEMENT`
+
+- `GUID int NOT NULL`
+- `DOCUMENT_ID int NOT NULL`
+- `RECEIVER_ID int NOT NULL`
+- `ELEMENT_TYPE int NOT NULL`
+- `POSITION_X float NOT NULL`
+- `POSITION_Y float NOT NULL`
+- `WIDTH float NOT NULL`
+- `HEIGHT float NOT NULL`
+- `PAGE int NOT NULL`
+- `REQUIRED bit NOT NULL`
+- `TOOLTIP nvarchar(512) NULL`
+- `READ_ONLY bit NOT NULL`
+- `ANNOTATION_INDEX int NOT NULL`
+- `ADDED_WHEN datetime NOT NULL`
+- `CHANGED_WHEN datetime NULL`
+- `CHANGED_WHO nvarchar(100) NULL`
+- `FULL_NAME nvarchar(100) NULL`
+- `POSITION nvarchar(100) NULL`
+- `PLACE nvarchar(100) NULL`
+- `INK varbinary(max) NULL`
+
+### `TBSIG_DOCUMENT_RECEIVER_ELEMENT_ANNOTATION`
+
+- `GUID bigint NOT NULL`
+- `ELEMENT_ID int NOT NULL`
+- `NAME nvarchar(100) NOT NULL`
+- `VALUE nvarchar(max) NOT NULL`
+- `ADDED_WHEN datetime NOT NULL`
+- `CHANGED_WHEN datetime NULL`
+- `CHANGED_WHO nvarchar(100) NULL`
+- `TYPE nvarchar(50) NOT NULL`
+- `POSITION_X float NULL`
+- `POSITION_Y float NULL`
+- `WIDTH float NULL`
+- `HEIGHT float NULL`
+
+### `TBSIG_DOCUMENT_STATUS`
+
+- `GUID int NOT NULL`
+- `ENVELOPE_ID int NOT NULL`
+- `RECEIVER_ID int NOT NULL`
+- `STATUS int NOT NULL`
+- `STATUS_CHANGED_WHEN datetime NULL`
+- `VALUE nvarchar(max) NULL`
+- `ADDED_WHEN datetime NOT NULL`
+- `CHANGED_WHEN datetime NULL`
+
+### `TBSIG_ENVELOPE_HISTORY`
+
+- `GUID bigint NOT NULL`
+- `ENVELOPE_ID int NOT NULL`
+- `USER_REFERENCE nvarchar(128) NOT NULL`
+- `STATUS int NOT NULL`
+- `ADDED_WHEN datetime NOT NULL`
+- `ACTION_DATE datetime NULL`
+- `COMMENT nvarchar(max) NULL`
+
+### `TBSIG_RECEIVER`
+
+- `GUID int NOT NULL`
+- `EMAIL_ADDRESS nvarchar(128) NOT NULL`
+- `SIGNATURE nvarchar(64) NOT NULL`
+- `ADDED_WHEN datetime NOT NULL`
+- `TOTP_SECRET_KEY nvarchar(max) NULL`
+- `TFA_REG_DEADLINE datetime NULL`
+- `CULTURE nvarchar(10) NULL`
+
+### `TBSIG_ENVELOPE_RECEIVER_READ_ONLY`
+
+- `GUID bigint NOT NULL`
+- `ENVELOPE_ID bigint NOT NULL`
+- `RECEIVER_MAIL nvarchar(250) NOT NULL`
+- `DATE_VALID date NOT NULL`
+- `ADDED_WHO varchar(100) NOT NULL`
+- `ADDED_WHEN datetime NULL`
+- `CHANGED_WHO varchar(100) NULL`
+- `CHANGED_WHEN datetime NULL`
+
+### `TBSIG_ENVELOPE_TYPE`
+
+- `GUID int NOT NULL`
+- `TITLE nvarchar(128) NOT NULL`
+- `LANGUAGE nvarchar(5) NOT NULL`
+- `EXPIRES_DAYS int NULL`
+- `CERTIFICATION_TYPE int NULL`
+- `USE_ACCESS_CODE bit NULL`
+- `FINAL_EMAIL_TO_CREATOR int NULL`
+- `FINAL_EMAIL_TO_RECEIVERS int NULL`
+- `ADDED_WHEN datetime NOT NULL`
+- `CHANGED_WHEN datetime NULL`
+- `EXPIRES_WARNING_DAYS int NULL`
+- `SEND_REMINDER_EMAILS bit NULL`
+- `FIRST_REMINDER_DAYS int NULL`
+- `REMINDER_INTERVAL_DAYS int NULL`
+- `CONTRACT_TYPE int NULL`
+
+### `TBSIG_EMAIL_TEMPLATE`
+
+- `GUID int NOT NULL`
+- `NAME nvarchar(64) NULL`
+- `BODY nvarchar(max) NULL`
+- `SUBJECT nvarchar(512) NULL`
+- `ADDED_WHEN datetime NOT NULL`
+- `CHANGED_WHEN datetime NULL`
+- `LANG_CODE varchar(5) NOT NULL`
+
+### `TBEMLP_EMAIL_OUT`
+
+- `GUID int NOT NULL`
+- `REMINDER_TYPE_ID int NOT NULL`
+- `SENDING_PROFILE int NOT NULL`
+- `REFERENCE_ID int NOT NULL`
+- `REFERENCE_STRING varchar(200) NULL`
+- `ENTITY_ID int NULL`
+- `WF_ID int NOT NULL`
+- `WF_REFERENCE varchar(200) NULL`
+- `EMAIL_ADRESS varchar(1000) NOT NULL`
+- `EMAIL_SUBJ varchar(500) NOT NULL`
+- `EMAIL_BODY varchar(max) NOT NULL`
+- `EMAIL_ATTMT1 varchar(512) NULL`
+- `EMAIL_SENT datetime NULL`
+- `COMMENT varchar(500) NULL`
+- `ADDED_WHO varchar(50) NOT NULL`
+- `ADDED_WHEN datetime NULL`
+- `CHANGED_WHO varchar(50) NULL`
+- `CHANGED_WHEN datetime NULL`
+- `ERROR_TIMESTAMP datetime NULL`
+- `ERROR_MSG varchar(900) NULL`
+- `ATTACHMENT1_BYTES varbinary(max) NULL`
+- `ATT1_RELATED_ID bigint NULL`
+- `ATT1_REL_TYPE varchar(20) NULL`
+
+## Constraints and indexes (relevant)
+
+From EF + DB metadata snapshot:
+
+- `TBSIG_ENVELOPE`: PK `PK_TBSIG_ENVELOPE (GUID)`.
+- `TBSIG_ENVELOPE_RECEIVER`: composite PK `PK_TBSIG_ENVELOPE_RECEIVER (ENVELOPE_ID, RECEIVER_ID)`.
+- `TBSIG_DOCUMENT_RECEIVER_ELEMENT`: PK `GUID`, plus unique key `UQTBSIG_DOCUMENT_RECEIVER_ELEMENT_DocID_PosX_PosY (DOCUMENT_ID, POSITION_X, POSITION_Y)`.
+- `TBSIG_RECEIVER`: PK `GUID`, unique key `UQTBSIG_RECEIVER (EMAIL_ADDRESS)`.
+- `TBEMLP_EMAIL_OUT`: PK `GUID`, FK `FK_TBEMLP_EMAIL_OUT_SENDING_PROFILE`.
+
+## Stored procedures: behavior and code call sites
+
+### Active in .NET code path
+
+1) `PRSIG_API_CREATE_ENVELOPE`
+- Purpose: creates envelope row (`STATUS=1002`, `SOURCE='API'`, defaults) and returns `ENVELOPE_UUID` via output.
+- DB writes: `TBSIG_ENVELOPE`.
+- Called by:
+  - SQL template `EnvelopeGenerator.Application/Common/SQL/EnvelopeCreateReadSQL.cs`
+  - executor `EnvelopeGenerator.Infrastructure/Executor/EnvelopeExecutor.cs`
+  - used in `EnvelopeReceiverController.CreateAsync` and `CreateEnvelopeReceiverCommandHandler`.
+
+2) `PRSIG_API_CREATE_RECEIVER`
+- Purpose: upserts `TBSIG_RECEIVER` by email, adds envelope assignment row with generated access code.
+- DB writes: `TBSIG_RECEIVER`, `TBSIG_ENVELOPE_RECEIVER`.
+- Called by:
+  - SQL template `EnvelopeGenerator.Application/Common/SQL/EnvelopeReceiverAddReadSQL.cs`
+  - executor `EnvelopeGenerator.Infrastructure/Executor/EnvelopeReceiverExecutor.cs`
+  - used in `EnvelopeReceiverController.CreateAsync` and `CreateEnvelopeReceiverCommandHandler`.
+
+3) `PRSIG_API_ADD_DOC`
+- Purpose: stores one document for envelope if absent; returns doc id.
+- DB writes: `TBSIG_ENVELOPE_DOCUMENT`.
+- Called by:
+  - SQL template `EnvelopeGenerator.Application/Common/SQL/DocumentCreateReadSQL.cs`
+  - executor `EnvelopeGenerator.Infrastructure/Executor/DocumentExecutor.cs`
+  - used in `EnvelopeReceiverController.CreateAsync`.
+
+4) `PRSIG_API_ADD_DOC_RECEIVER_ELEM`
+- Purpose: inserts signature element record if `(DOC_ID, RECEIVER_ID)` pair does not exist.
+- DB writes: `TBSIG_DOCUMENT_RECEIVER_ELEMENT`.
+- Called directly by:
+  - `EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/EnvelopeReceiverController.cs`
+
+5) `PRSIG_API_ADD_HISTORY_STATE`
+- Purpose: appends history row with status and user reference.
+- DB writes: `TBSIG_ENVELOPE_HISTORY`.
+- Called directly by:
+  - `EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/EnvelopeReceiverController.cs`
+
+### Legacy/other path references in repo
+
+- `PRSIG_GET_ENVELOPES_FOR_USER` and `PRSIG_GET_CLOSED_ENVELOPES_FOR_USER` are called in legacy VB path:
+  - `EnvelopeGenerator.CommonServices/Models/EnvelopeModel.vb`
+
+- `PRSIG_API_WITHDRAW_ENVELOPE` exists in DB snapshot but no active `.cs` call site found in current server flow.
+
+## Trigger behavior and where they are wired
+
+## How trigger names are wired in app
+
+- Config source: `EnvelopeGenerator.Server/EnvelopeGenerator.Server/appsettings.json` -> `DbTriggerParams`.
+- DI binding: `EnvelopeGenerator.Infrastructure/DependencyInjection.cs` (`AddDbTriggerParams`).
+- Model binding: `EnvelopeGenerator.Infrastructure/EGDbContext.cs` -> `AddTrigger<T>()` -> `ToTable(tb => tb.HasTrigger(triggerName))`.
+
+### Trigger definitions observed in DB snapshot
+
+1) `TBSIG_DOCUMENT_RECEIVER_ELEMENT_AFT_INS`
+- Fires on insert of `TBSIG_DOCUMENT_RECEIVER_ELEMENT`.
+- Normalizes/rewrites `POSITION_X`, `POSITION_Y` and sets `CHANGED_WHO='TBSIG_DOC_REC_EL_AFT_INS'`.
+
+2) `TBSIG_DOCUMENT_RECEIVER_ELEMENT_AFT_UPD`
+- Fires on update of `TBSIG_DOCUMENT_RECEIVER_ELEMENT`.
+- Rewrites coordinates and `CHANGED_WHO='TBSIG_DOC_REC_EL_AFT_UPD'` except when `CHANGED_WHO='OFFSET_Y_POS'`.
+
+3) `TBSIG_ENVELOPE_HISTORY_AFT_INS`
+- Fires on history insert.
+- Central state machine side-effects:
+  - syncs `TBSIG_ENVELOPE.STATUS` for selected `100x` states,
+  - on `1003` applies Y-offset update to receiver elements,
+  - on `2005` calculates partial/fully signed and may insert follow-up `1006` history,
+  - on `2007` (type-dependent reject path) writes rejection emails into `TBEMLP_EMAIL_OUT` and updates envelope rejected state,
+  - on `3001` invitation-message counting can move envelope to `1004`.
+
+4) `TBSIG_EMAIL_TEMPLATE_AFT_UPD`
+- Fires on update of `TBSIG_EMAIL_TEMPLATE`.
+- Sets `CHANGED_WHEN = GETDATE()`.
+
+5) `TBSIG_ENVELOPE_RECEIVER_READ_ONLY_UPD`
+- Fires on update of `TBSIG_ENVELOPE_RECEIVER_READ_ONLY`.
+- Updates config timestamp row (`TBSIG_CONFIG.GUID = 1`).
+
+6) `TBEMLP_EMAIL_OUT_AFT_UPD`
+- Fires on update of `TBEMLP_EMAIL_OUT`.
+- When `EMAIL_SENT` changes and `WF_ID in (3001..3005)`, writes corresponding history entries to `TBSIG_ENVELOPE_HISTORY`.
+
+### Trigger mismatch alert (important)
+
+- `DbTriggerParams` contains `TBEMLP_EMAIL_OUT_AFT_INS`, but this trigger was not found in the snapshot DB (`ExistsInDb = 0`).
+- `TBEMLP_EMAIL_OUT_AFT_UPD` exists and is active.
+
+This should be treated as environment drift and validated before migrations.
+
+## Known model-vs-DB drift risks
+
+These are not necessarily bugs, but they are migration risk hotspots:
+
+- `Receiver.EmailAddress` is `[StringLength(250)]` in entity, DB column is `nvarchar(128)`.
+- `EnvelopeReceiverReadOnly.AddedWho` entity expects `nvarchar(250)`, DB column is `varchar(100)`.
+- `EnvelopeReceiver` entity does not model DB columns `GUID` and `PARENT_ENVELOPE_RECEIVER_ID`.
+- `Envelope` entity does not explicitly model some DB columns (`VERIFICATION_TYPE`, `LANG_CODE`, `SOURCE`).
+- `EmailOut` entity has `[NotMapped] AddedWhen`, while DB has `ADDED_WHEN` column.
+
+Before schema changes, reconcile these deltas intentionally (either mapping update or documented accepted divergence).
+
+## Migration-safe operating rules
+
+- Do not rely on implicit trigger behavior; document expected side effects in feature code touching history/status flows.
+- Any change to `TBSIG_ENVELOPE_HISTORY` semantics requires trigger impact review first.
+- Keep `DbTriggerParams` synchronized with actual DB trigger inventory per environment.
+- For stored procedure changes, update both:
+  - SQL wrapper templates (`Application/Common/SQL/*`)
+  - direct SQL callers in controllers/executors.
+
+## Refresh checklist (read-only)
+
+Run these metadata checks before/after DB migration:
+
+1. Column inventory per table (`INFORMATION_SCHEMA.COLUMNS`).
+2. Constraint inventory (`INFORMATION_SCHEMA.TABLE_CONSTRAINTS` + `KEY_COLUMN_USAGE`).
+3. Trigger inventory (`sys.triggers`) and definitions (`OBJECT_DEFINITION`).
+4. Stored procedure inventory (`sys.procedures`) and definitions (`OBJECT_DEFINITION`).
+5. Repo call-site grep for `PRSIG_` names to detect dead or missing integration points.

EnvelopeGenerator.Application/Common/Behaviors/ValidationBehavior.cs

@@ -0,0 +1,40 @@
+using DigitalData.Core.Exceptions;
+using FluentValidation;
+using MediatR;
+
+namespace EnvelopeGenerator.Application.Common.Behaviors;
+
+public class ValidationBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse>
+    where TRequest : notnull
+{
+    private readonly IEnumerable<IValidator<TRequest>> _validators;
+
+    public ValidationBehavior(IEnumerable<IValidator<TRequest>> validators)
+    {
+        _validators = validators;
+    }
+
+    public async Task<TResponse> Handle(
+        TRequest request,
+        RequestHandlerDelegate<TResponse> next,
+        CancellationToken cancellationToken)
+    {
+        if (_validators.Any())
+        {
+            var context = new ValidationContext<TRequest>(request);
+            var failures = _validators
+                .Select(v => v.Validate(context))
+                .SelectMany(r => r.Errors)
+                .Where(f => f is not null)
+                .ToList();
+
+            if (failures.Count > 0)
+            {
+                var message = string.Join("; ", failures.Select(f => f.ErrorMessage).Distinct());
+                throw new BadRequestException(message);
+            }
+        }
+
+        return await next();
+    }
+}

EnvelopeGenerator.Application/Common/Configurations/ESignParams.cs

@@ -0,0 +1,17 @@
+namespace EnvelopeGenerator.Application.Common.Configurations;
+
+/// <summary>
+/// 
+/// </summary>
+public class ESignParams
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public required string ApplicationName { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string DefaultReason { get; set; } = string.Empty;
+}

EnvelopeGenerator.Application/Common/Configurations/SignatureFieldParams.cs

@@ -0,0 +1,17 @@
+namespace EnvelopeGenerator.Application.Common.Configurations;
+
+/// <summary>
+/// 
+/// </summary>
+public class SignatureFieldParams
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public double Width { get; init; } = 1.77;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public double Height { get; init; } = 1.96;
+}

EnvelopeGenerator.Application/Common/Dto/DocReceiverElementDto.cs

@@ -1,12 +1,14 @@
-using EnvelopeGenerator.Domain.Constants;
+using EnvelopeGenerator.Application.Common.Dto.Receiver;
+using EnvelopeGenerator.Domain.Constants;
 using EnvelopeGenerator.Domain.Interfaces;
 
 namespace EnvelopeGenerator.Application.Common.Dto;
 
+// TODO: Add the “Reason” property and integrate with UI and the digital signature process.
 /// <summary>
 /// Data Transfer Object representing a positioned element assigned to a document receiver.
 /// </summary>
-public class DocReceiverElementDto : IDocReceiverElement
+public class DocReceiverElementDto : IDocReceiverElement, ISignatureInkPayload
 {
     /// <summary>
     /// Gets or sets the unique identifier of the element.
@@ -18,11 +20,21 @@ public class DocReceiverElementDto : IDocReceiverElement
     /// </summary>
     public int DocumentId { get; set; }
 
+    /// <summary>
+    /// 
+    /// </summary>
+    public virtual DocumentDto? Document { get; set; }
+
     /// <summary>
     /// Gets or sets the identifier of the receiver.
     /// </summary>
     public int ReceiverId { get; set; }
 
+    /// <summary>
+    /// 
+    /// </summary>
+    public virtual ReceiverDto? Receiver { get; set; }
+
     /// <summary>
     /// Gets or sets the type of the element.
     /// </summary>
@@ -122,4 +134,41 @@ public class DocReceiverElementDto : IDocReceiverElement
     /// 
     /// </summary>
     public byte[]? Ink { get; set; }
+
+    /// <summary>
+    /// Returns the stored signature bytes as an image payload with detected MIME type.
+    /// </summary>
+    /// <exception cref="InvalidOperationException">Thrown when signature image bytes do not exist.</exception>
+    public (byte[] Bytes, string ContentType, string FileExtension) ToImage()
+    {
+        if (Ink is not { Length: > 0 })
+            throw new InvalidOperationException("Signature image (Ink) does not exist.");
+
+        if (HasPrefix(Ink, 0x89, 0x50, 0x4E, 0x47))
+            return (Ink, "image/png", ".png");
+
+        if (HasPrefix(Ink, 0xFF, 0xD8, 0xFF))
+            return (Ink, "image/jpeg", ".jpg");
+
+        if (HasPrefix(Ink, 0x52, 0x49, 0x46, 0x46) &&
+            Ink.Length >= 12 &&
+            Ink[8] == 0x57 && Ink[9] == 0x45 && Ink[10] == 0x42 && Ink[11] == 0x50)
+            return (Ink, "image/webp", ".webp");
+
+        return (Ink, "application/octet-stream", ".bin");
+    }
+
+    private static bool HasPrefix(byte[] data, params byte[] prefix)
+    {
+        if (data.Length < prefix.Length)
+            return false;
+
+        for (var i = 0; i < prefix.Length; i++)
+        {
+            if (data[i] != prefix[i])
+                return false;
+        }
+
+        return true;
+    }
 }

EnvelopeGenerator.Application/Common/Dto/DocumentDetailsDto.cs

@@ -0,0 +1,27 @@
+namespace EnvelopeGenerator.Application.Common.Dto;
+
+/// <summary>
+/// Data Transfer Object representing document metadata and elements without binary payload.
+/// </summary>
+public record DocumentDetailsDto
+{
+    /// <summary>
+    /// Gets or sets the unique identifier of the document.
+    /// </summary>
+    public int Id { get; init; }
+
+    /// <summary>
+    /// Gets or sets the envelope ID to which the document belongs.
+    /// </summary>
+    public int EnvelopeId { get; init; }
+
+    /// <summary>
+    /// Gets or sets the date and time when the document was added.
+    /// </summary>
+    public DateTime AddedWhen { get; init; }
+
+    /// <summary>
+    /// Gets or sets the collection of elements associated with the document for receiver interactions, if any.
+    /// </summary>
+    public IEnumerable<DocReceiverElementDto>? Elements { get; init; }
+}

EnvelopeGenerator.Application/Common/Dto/DocumentDto.cs

@@ -3,30 +3,25 @@
 /// <summary>
 /// Data Transfer Object representing a document within an envelope, including optional binary data and form elements.
 /// </summary>
-public class DocumentDto
+public record DocumentDto : DocumentDetailsDto
 {
     /// <summary>
-    /// Gets or sets the unique identifier of the document.
+    /// 
     /// </summary>
-    public int Id { get; set; }
+    public DocumentDto() { }
 
     /// <summary>
-    /// Gets or sets the envelope ID to which the document belongs.
+    /// 
     /// </summary>
-    public int EnvelopeId { get; set; }
-
-    /// <summary>
-    /// Gets or sets the date and time when the document was added.
-    /// </summary>
-    public DateTime AddedWhen { get; set; }
+    /// <param name="byteData"></param>
+    /// <param name="details"></param>
+    public DocumentDto(byte[] byteData, DocumentDetailsDto details) : base(details)
+    {
+        ByteData = byteData;
+    }
 
     /// <summary>
     /// Gets or sets the binary data of the document, if available.
     /// </summary>
     public byte[]? ByteData { get; set; }
-
-    /// <summary>
-    /// Gets or sets the collection of elements associated with the document for receiver interactions, if any.
-    /// </summary>
-    public IEnumerable<DocReceiverElementDto>? Elements { get; set; }
 }

EnvelopeGenerator.Application/Common/Dto/EnvelopeDto.cs

@@ -62,7 +62,7 @@ public record EnvelopeDto : IEnvelope
     /// <summary>
     /// 
     /// </summary>
-    public int? ContractType { get; set; }
+    public ContractType? ContractType { get; set; }
 
     /// <summary>
     /// Default value is 'de-DE'
@@ -84,7 +84,42 @@ public record EnvelopeDto : IEnvelope
     /// <summary>
     /// 
     /// </summary>
-    public int? CertificationType { get; set; }
+    public CertificationType? CertificationType { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public int? FinalEmailToCreator { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public int? FinalEmailToReceivers { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public bool? SendReminderEmails { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public int? FirstReminderDays { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public int? ReminderIntervalDays { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public int? ExpiresWhenDays { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public int? ExpiresWarningWhenDays { get; set; }
 
     /// <summary>
     /// 

EnvelopeGenerator.Application/Common/Dto/EnvelopeTypeDto.cs

@@ -1,4 +1,6 @@
-namespace EnvelopeGenerator.Application.Common.Dto;
+using EnvelopeGenerator.Domain.Constants;
+
+namespace EnvelopeGenerator.Application.Common.Dto;
 
 /// <summary>
 /// Data Transfer Object representing a type of envelope with its configuration settings.
@@ -28,7 +30,7 @@ public class EnvelopeTypeDto
     /// <summary>
     /// Gets or sets the certification type identifier.
     /// </summary>
-    public int? CertificationType { get; set; }
+    public CertificationType? CertificationType { get; set; }
 
     /// <summary>
     /// Gets or sets a value indicating whether an access code is required.
@@ -78,5 +80,5 @@ public class EnvelopeTypeDto
     /// <summary>
     /// Gets or sets the contract type associated with the envelope type.
     /// </summary>
-    public int? ContractType { get; set; }
+    public ContractType? ContractType { get; set; }
 }

EnvelopeGenerator.Application/Common/Dto/PdfPageImageDto.cs

@@ -0,0 +1,16 @@
+namespace EnvelopeGenerator.Application.Common.Dto;
+
+public sealed class PdfPageImageDto
+{
+    public int PageNumber { get; init; }
+
+    public double WidthPt { get; init; }
+
+    public double HeightPt { get; init; }
+
+    public int WidthPx { get; init; }
+
+    public int HeightPx { get; init; }
+
+    public string ImageDataUrl { get; init; } = string.Empty;
+}

EnvelopeGenerator.Application/Common/Dto/PdfRenderRequestDto.cs

@@ -0,0 +1,6 @@
+namespace EnvelopeGenerator.Application.Common.Dto;
+
+public sealed class PdfRenderRequestDto
+{
+    public byte[]? PdfBytes { get; init; }
+}

EnvelopeGenerator.Application/Common/Dto/PdfSignOptionsDto.cs

@@ -0,0 +1,54 @@
+using EnvelopeGenerator.Application.Common.Enums;
+
+namespace EnvelopeGenerator.Application.Common.Dto;
+
+/// <summary>
+/// 
+/// </summary>
+public sealed record PdfSignOptionsDto
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public long DocumentElementId { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string Name { get; set; } = null!;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string Reason { get; set; } = null!;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string Location { get; set; } = null!;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string? Email { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string? Phone { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string ApplicationName { get; set; } = null!;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public PdfSignatureCertificationLevel CertificationLevel { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public PdfSignatureAppearanceDto? Appearance { get; set; }
+}

EnvelopeGenerator.Application/Common/Dto/PdfSignatureAppearanceDto.cs

@@ -0,0 +1,96 @@
+namespace EnvelopeGenerator.Application.Common.Dto;
+
+/// <summary>
+/// 
+/// </summary>
+public enum PdfSignatureCoordinateUnit
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    Point = 0,
+
+    /// <summary>
+    /// 
+    /// </summary>
+    Inch = 1
+}
+
+/// <summary>
+/// 
+/// </summary>
+public enum PdfSignatureCoordinateOrigin
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    BottomLeft = 0,
+
+    /// <summary>
+    /// 
+    /// </summary>
+    TopLeft = 1
+}
+
+/// <summary>
+/// 
+/// </summary>
+/// <param name="PageNumber"></param>
+/// <param name="Left"></param>
+/// <param name="Bottom"></param>
+/// <param name="Width"></param>
+/// <param name="Height"></param>
+/// <param name="ShowLabels"></param>
+/// <param name="ShowName"></param>
+/// <param name="ShowDate"></param>
+/// <param name="ShowReason"></param>
+/// <param name="ShowLocation"></param>
+/// <param name="ShowDistinguishedName"></param>
+/// <param name="DateTimeFormat"></param>
+/// <param name="CoordinateUnit"></param>
+/// <param name="CoordinateOrigin"></param>
+public sealed record PdfSignatureAppearanceDto(
+    int PageNumber,
+    double Left,
+    double Bottom,
+    double Width,
+    double Height,
+    bool ShowLabels = false,
+    bool ShowName = false,
+    bool ShowDate = false,
+    bool ShowReason = false,
+    bool ShowLocation = false,
+    bool ShowDistinguishedName = false,
+    string DateTimeFormat = "dd.MM.yyyy HH:mm:ss zzz",
+    PdfSignatureCoordinateUnit CoordinateUnit = PdfSignatureCoordinateUnit.Point,
+    PdfSignatureCoordinateOrigin CoordinateOrigin = PdfSignatureCoordinateOrigin.BottomLeft)
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="FamilyName"></param>
+    /// <param name="Size"></param>
+    /// <param name="IsBold"></param>
+    /// <param name="IsItalic"></param>
+    /// <param name="IsUnderline"></param>
+    public sealed record FontDto(string FamilyName = "Helvetica", float Size = 10, bool IsBold = false, bool IsItalic = false, bool IsUnderline = false)
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        public RgbaColorDto Color { get; init; } = new();
+    }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="R"></param>
+    /// <param name="G"></param>
+    /// <param name="B"></param>
+    public sealed record RgbaColorDto(double R = 0, double G = 0, double B = 0);
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public FontDto Font { get; init; } = new();
+} 

EnvelopeGenerator.Application/Common/Dto/PdfSignatureCheckResultDto.cs

@@ -0,0 +1,57 @@
+namespace EnvelopeGenerator.Application.Common.Dto;
+
+public sealed record PdfSignaturePrincipalDto(
+    string? CommonName,
+    string? Organization,
+    string? Country,
+    string? Full);
+
+public sealed record PdfSignatureCertificateInfoDto(
+    PdfSignaturePrincipalDto IssuedTo,
+    PdfSignaturePrincipalDto IssuedBy,
+    string? SerialNumber,
+    DateTimeOffset? ValidFrom,
+    DateTimeOffset? ValidTo,
+    bool SelfSigned,
+    bool Expired,
+    bool NotYetValid,
+    bool IsSigner,
+    int? Version,
+    string? KeyAlgorithm,
+    string? SignatureAlgorithm,
+    string? Pem,
+    int? KeySizeBits);
+
+public sealed record PdfSignatureCheckItemDto(
+    bool CoversWholeDoc,
+    string? Reason,
+    string? BusinessReason,
+    string? Location,
+    string? DeclaredName,
+    string? ContactInfo,
+    string? Email,
+    string? Phone,
+    string? DigestAlgorithm,
+    string? SignatureAlgorithm,
+    string? SignerName,
+    string? Issuer,
+    string? SerialNumber,
+    DateTimeOffset? ValidFrom,
+    DateTimeOffset? ValidTo,
+    string ExpiryCheckedAgainst,
+    IReadOnlyList<PdfSignatureCertificateInfoDto> Certificates,
+    bool Unchanged,
+    string? FieldName,
+    bool IsCryptographicallyValid,
+    string? SigningTime,
+    string? Filter,
+    string? SubFilter,
+    string? ApplicationName,
+    long? DocumentElementId,
+    string? OriginalDocumentSha256,
+    string? MessageDigestHex,
+    string? Error);
+
+public sealed record PdfSignatureCheckResultDto(
+    bool Signed,
+    IReadOnlyList<PdfSignatureCheckItemDto> Signatures);

EnvelopeGenerator.Application/Common/Dto/Receiver/RecentReceiverSuggestionDto.cs

@@ -0,0 +1,10 @@
+namespace EnvelopeGenerator.Application.Common.Dto.Receiver;
+
+public class RecentReceiverSuggestionDto
+{
+    public required string FullName { get; init; }
+
+    public required string EmailAddress { get; init; }
+
+    public required DateTime LastUsedAt { get; init; }
+}

EnvelopeGenerator.Application/Common/Enums/PdfSignatureCertificationLevel.cs

@@ -0,0 +1,27 @@
+namespace EnvelopeGenerator.Application.Common.Enums;
+
+/// <summary>
+/// 
+/// </summary>
+public enum PdfSignatureCertificationLevel
+{
+    /// <summary>
+    /// All changes are allowed
+    /// </summary>
+    NoCertification = 0,
+
+    /// <summary>
+    /// No changes are allowed
+    /// </summary>
+    NoChangesAllowed,
+
+    /// <summary>
+    /// Allows users to fill in forms and sign the document.
+    /// </summary>
+    FillForms,
+
+    /// <summary>
+    /// Allows users to fill in forms, create, modify and delete annotations, and sign the document.
+    /// </summary>
+    FillFormsAndAnnotate
+}

EnvelopeGenerator.Application/Common/Interfaces/Doc/IPdfPageImageRenderer.cs

@@ -0,0 +1,66 @@
+using DigitalData.Core.Exceptions;
+using EnvelopeGenerator.Application.Common.Dto;
+using EnvelopeGenerator.Domain.Interfaces;
+
+namespace EnvelopeGenerator.Application.Common.Interfaces.Doc;
+
+/// <summary>
+/// 
+/// </summary>
+public interface IPdfPageImageRenderer
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="pdfBytes"></param>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    Task<IReadOnlyList<PdfPageImageDto>> RenderPagesAsImagesAsync(byte[] pdfBytes, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="element"></param>
+    /// <returns></returns>
+    Stream ComposeSignaturePreviewPng(ISignatureInkPayload element);
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="bytes"></param>
+    /// <returns></returns>
+    public bool IsSupportedImageFormat(byte[] bytes);
+}
+
+/// <summary>
+/// 
+/// </summary>
+public static class PdfPageImageRendererExtensions
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="renderer"></param>
+    /// <param name="inkBytes"></param>
+    /// <returns></returns>
+    /// <exception cref="BadRequestException"></exception>
+    public static byte[] EnsureSupportedImageBytes(this IPdfPageImageRenderer renderer, byte[] inkBytes)
+    {
+        if (!renderer.IsSupportedImageFormat(inkBytes))
+            throw new BadRequestException("Only PNG and JPEG signature formats are supported.");
+
+        return inkBytes;
+    }
+
+    public static byte[] ComposeSignaturePreviewPngBytes(this IPdfPageImageRenderer renderer, ISignatureInkPayload element)
+    {
+        using var stream = renderer.ComposeSignaturePreviewPng(element);
+
+        if (stream is MemoryStream memoryStream)
+            return memoryStream.ToArray();
+
+        using var copy = new MemoryStream();
+        stream.CopyTo(copy);
+        return copy.ToArray();
+    }
+}

EnvelopeGenerator.Application/Common/Interfaces/IRequestContext.cs

@@ -0,0 +1,12 @@
+namespace EnvelopeGenerator.Application.Common.Interfaces;
+
+/// <summary>
+/// 
+/// </summary>
+public interface IRequestContext
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    string? Origin { get; }
+}

EnvelopeGenerator.Application/Common/Interfaces/Services/IPdfDigitalSignatureService.cs

@@ -0,0 +1,29 @@
+using EnvelopeGenerator.Application.Common.Dto;
+
+namespace EnvelopeGenerator.Application.Common.Interfaces.Services;
+
+/// <summary>
+/// Defines PDF digital-signing operations for the application boundary.
+/// </summary>
+public interface IPdfDigitalSignatureService
+{
+    /// <summary>
+    /// Creates a digital signature for the provided PDF bytes and returns
+    /// a new signed PDF document.
+    /// </summary>
+    /// <param name="inputPdf">Source PDF content stream.</param>
+    /// <param name="outputPdf">Destination stream for signed PDF output.</param>
+    /// <param name="options">Optional signing options that map to PDF signature metadata fields.</param>
+    /// <param name="image">Optional image stream for signature appearance.</param>
+    /// <param name="cancellationToken">Cancellation token for cooperative cancellation.</param>
+    Task SignPdfAsync(Stream inputPdf, Stream outputPdf, PdfSignOptionsDto? options = null, Stream? image = null, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Checks whether the provided PDF contains signature field(s) and whether
+    /// those signatures are cryptographically valid.
+    /// </summary>
+    /// <param name="inputPdf">PDF content stream to inspect.</param>
+    /// <param name="cancellationToken">Cancellation token for cooperative cancellation.</param>
+    /// <returns>A structured result containing signature presence and per-signature details.</returns>
+    Task<PdfSignatureCheckResultDto> CheckPdfSignatureAsync(Stream inputPdf, CancellationToken cancellationToken = default);
+}

EnvelopeGenerator.Application/Common/Interfaces/Services/Notification/DocumentReceivedNotification.cs

@@ -0,0 +1,98 @@
+using EnvelopeGenerator.Application.Common.Extensions;
+using EnvelopeGenerator.Domain.Constants;
+
+namespace EnvelopeGenerator.Application.Common.Interfaces.Services.Notification;
+
+/// <summary>
+/// 
+/// </summary>
+public record DocumentReceivedNotification : EnvelopeNotificationBase
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public required string DocumentTitle { get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required string NameReceiver { get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required string NameSender { get; init; }
+
+    /// <summary>
+    /// [SIGNATURE_TYPE]
+    /// </summary>
+    public required bool IsReadAndConfirm { private get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string SignatureType => IsReadAndConfirm ? "Signieren" : "Lesen und bestätigen";
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required bool AdvancedSignature { private get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string DocumentProcess => AdvancedSignature ? " und elektronisch unterschreiben" : string.Empty;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required Uri Origin { private get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required string EnvelopeUuid { private get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required string ReceiverSignature { private get; init; }
+
+    private Uri EnvelopeURL => new(Origin, $"Envelope/{(EnvelopeUuid, ReceiverSignature).ToEnvelopeKey()}");
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string LinkToDocument => EnvelopeURL.AbsoluteUri;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string LinkToDocumentText
+    {
+        get
+        {
+            var urlText = EnvelopeURL.ToString();
+            return $"{urlText[..Math.Min(urlText.Length, 40)]}..";
+        }
+    }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required string Message { get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string NamePortal { get; set; } = "signFLOW Portal";
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <returns></returns>
+    public override EmailTemplateType GetTemplateType()
+    {
+        return EmailTemplateType.DocumentReceived;
+    }
+}

EnvelopeGenerator.Application/Common/Interfaces/Services/Notification/DocumentSignedNotification.cs

@@ -0,0 +1,59 @@
+using EnvelopeGenerator.Domain.Constants;
+
+namespace EnvelopeGenerator.Application.Common.Interfaces.Services.Notification;
+
+/// <summary>
+/// 
+/// </summary>
+public record DocumentSignedNotification : EnvelopeNotificationBase
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public required string DocumentTitle { get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required string NameReceiver { get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string NamePortal { get; init; } = "signFLOW Portal";
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required bool IsReadAndConfirm { private get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string ReceiverAction => IsReadAndConfirm ? "bestätigt" : "unterschrieben";
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string FinalStatus => IsReadAndConfirm ? "Lesebestätigung" : "Signatur";
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string FinalAction => IsReadAndConfirm ? "Empfänger bestätigt" : "Vertragspartner unterzeichnet";
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public override EmailTemplateType GetTemplateType() => EmailTemplateType.DocumentSigned;
+}
+
+/*
+
+Umschlag abgeschlossen: '[DOCUMENT_TITLE]'
+
+---
+
+Guten Tag [NAME_RECEIVER],<br />  <br />  Der Vorgang <B><I>'[DOCUMENT_TITLE]'</I></B> wurde erfolgreich abgeschlossen.<br />  <br />  Sie erhalten das Dokument mit einem detaillierten Ergebnisbericht als Anhang zu dieser Email.<br />  <br />  Mit freundlichen Grüßen<br />  <br />  [NAME_PORTAL]
+
+*/

EnvelopeGenerator.Application/Common/Interfaces/Services/Notification/EnvelopeNotificationBase.cs

@@ -0,0 +1,19 @@
+using EnvelopeGenerator.Domain.Constants;
+
+namespace EnvelopeGenerator.Application.Common.Interfaces.Services.Notification;
+
+/// <summary>
+/// 
+/// </summary>
+public abstract record EnvelopeNotificationBase
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public abstract EmailTemplateType GetTemplateType();
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public IReadOnlyList<(string FileName, byte[] Content)>? Attachments { get; init; }
+}

EnvelopeGenerator.Application/Common/Interfaces/Services/Notification/IEnvelopeNotificationService.cs

@@ -0,0 +1,18 @@
+namespace EnvelopeGenerator.Application.Common.Interfaces.Services.Notification;
+
+/// <summary>
+/// 
+/// </summary>
+public interface IEnvelopeNotificationService
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <typeparam name="TEnvelopeNotificationBase"></typeparam>
+    /// <param name="receiverEmail"></param>
+    /// <param name="notification"></param>
+    /// <param name="cancel"></param>
+    /// <returns></returns>
+    public Task Notify<TEnvelopeNotificationBase>(string receiverEmail, TEnvelopeNotificationBase notification, CancellationToken cancel = default)
+        where TEnvelopeNotificationBase : EnvelopeNotificationBase;
+}

EnvelopeGenerator.Application/Common/MappingProfile.cs

@@ -32,6 +32,7 @@ public class MappingProfile : Profile
             .ForMember(dest => dest.EnvelopeTypeTitle,
                        opt  => opt.MapFrom(src => src.Type != null ? src.Type.Title : null));
         CreateMap<Document, DocumentDto>();
+        CreateMap<Document, DocumentDetailsDto>();
         CreateMap<History, HistoryDto>().ForMember(dest => dest.ActionDate, opt => opt.MapFrom(src => src.ChangedWhen));
         CreateMap<History, HistoryCreateDto>().ForMember(dest => dest.ActionDate, opt => opt.MapFrom(src => src.ChangedWhen));
         CreateMap<EnvelopeReceiver, EnvelopeReceiverDto>();

EnvelopeGenerator.Application/Common/Notifications/SendMailHandler.cs

@@ -2,6 +2,7 @@
 using DigitalData.EmailProfilerDispatcher.Abstraction.Entities;
 using EnvelopeGenerator.Application.Common.Configurations;
 using EnvelopeGenerator.Application.Common.Extensions;
+using EnvelopeGenerator.Application.Common.Notifications.EnvelopeDeleted;
 using EnvelopeGenerator.Domain.Constants;
 using EnvelopeGenerator.Domain.Entities;
 using MediatR;
@@ -96,6 +97,10 @@ public abstract class SendMailHandler<TNotification> : INotificationHandler<TNot
     /// <exception cref="NotImplementedException"></exception>
     public virtual async Task Handle(TNotification notification, CancellationToken cancel)
     {
+        // do not send email if the envelope is deleted and the status is less than or equal to EnvelopeSaved
+        if (notification is EnvelopeDeletedNotification delNot && delNot.Envelope.Status <= EnvelopeStatus.EnvelopeSaved)
+            return;
+
         var placeHolders = CreatePlaceHolders(notification);
 
         var temp = await TempRepo

EnvelopeGenerator.Application/DependencyInjection.cs

@@ -10,6 +10,8 @@ using System.Reflection;
 using MediatR;
 using EnvelopeGenerator.Application.DocReceiverElements.Commands;
 using EnvelopeGenerator.Application.DocReceiverElements.Behaviors;
+using EnvelopeGenerator.Application.Common.Behaviors;
+using FluentValidation;
 
 namespace EnvelopeGenerator.Application;
 
@@ -47,8 +49,10 @@ public static class DependencyInjection
 
         services.Configure<DispatcherParams>(config.GetSection(nameof(DispatcherParams)));
         services.Configure<MailParams>(config.GetSection(nameof(MailParams)));
+        services.Configure<SignatureFieldParams>(config.GetSection(nameof(SignatureFieldParams)));
         services.Configure<AuthenticatorParams>(config.GetSection(nameof(AuthenticatorParams)));
         services.Configure<TotpSmsParams>(config.GetSection(nameof(TotpSmsParams)));
+        services.Configure<ESignParams>(config.GetSection(nameof(ESignParams)));
 
         services.AddHttpClientService<GtxMessagingParams>(config.GetSection(nameof(GtxMessagingParams)));
         services.TryAddScoped<ISmsSender, GTXSmsSender>();          // Changed: Singleton → Scoped
@@ -60,6 +64,9 @@ public static class DependencyInjection
         {
             cfg.RegisterServicesFromAssembly(Assembly.GetExecutingAssembly());
 
+            // Generic request validation
+            cfg.AddOpenBehavior(typeof(ValidationBehavior<,>));
+            
             // Register SignCommand pipeline behaviors in execution order
             // 0. EnvelopeReceiverResolutionBehavior - Resolves EnvelopeReceiver from query parameters (executes FIRST)
             cfg.AddBehavior<IPipelineBehavior<SigningCommand, Unit>, EnvelopeReceiverResolutionBehavior>();
@@ -80,6 +87,8 @@ public static class DependencyInjection
             cfg.AddBehavior<IPipelineBehavior<SigningCommand, Unit>, SendSignedMailBehavior>();
         });
 
+        services.AddValidatorsFromAssembly(Assembly.GetExecutingAssembly());
+
         return services;
     }
 }

EnvelopeGenerator.Application/DocReceiverElements/Queries/ReadDocReceiverElementQuery.cs

@@ -14,6 +14,15 @@ namespace EnvelopeGenerator.Application.DocReceiverElements.Queries;
 /// </summary>
 public record ReadDocReceiverElementQuery : EnvelopeReceiverQueryBase, IRequest<IEnumerable<DocReceiverElementDto>>
 {
+    /// <summary>
+    /// 
+    /// </summary>
+    public int? Id { get; set; } = null;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public bool IncludeDocument { get; set; } = false;
 }
 
 /// <summary>
@@ -47,7 +56,10 @@ public class ReadDocReceiverElementQueryHandler : IRequestHandler<ReadDocReceive
     {
         var q = _repository.Query;
 
-        if(request.Envelope.Id is int envelopeId)
+        if (request.Id is not null)
+            q = q.Where(e => e.Id == request.Id);
+
+        if (request.Envelope.Id is int envelopeId)
             q = q.Where(e => e.Document.EnvelopeId == envelopeId);
 
         if (request.Envelope.Uuid is string envelopeUuid)
@@ -59,6 +71,9 @@ public class ReadDocReceiverElementQueryHandler : IRequestHandler<ReadDocReceive
         if (request.Receiver.Signature is string signature)
             q = q.Where(e => e.Receiver.Signature == signature);
 
+        if( request.IncludeDocument)
+            q = q.Include(e => e.Document);
+
         var elements = await q.ToListAsync(cancellationToken);
 
         return _mapper.Map<IEnumerable<DocReceiverElementDto>>(elements);

EnvelopeGenerator.Application/Documents/Queries/ReadDocumentDetailsQuery.cs

@@ -0,0 +1,102 @@
+using DigitalData.Core.Abstraction.Application.Repository;
+using EnvelopeGenerator.Application.Common.Dto;
+using EnvelopeGenerator.Domain.Entities;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace EnvelopeGenerator.Application.Documents.Queries;
+
+/// <summary>
+/// Represents a query to read document metadata/details without binary payload.
+/// </summary>
+/// <param name="EnvelopeId">The identifier of the envelope associated with the document.</param>
+/// <param name="UserId">The unique identifier of the sending user. Optional.</param>
+public record ReadDocumentDetailsQuery(int EnvelopeId, int? UserId = null) : IRequest<DocumentDetailsDto?>;
+
+/// <summary>
+/// Handles queries for reading document details without loading BYTE_DATA.
+/// </summary>
+public class ReadDocumentDetailsQueryHandler : IRequestHandler<ReadDocumentDetailsQuery, DocumentDetailsDto?>
+{
+    private readonly IRepository<Document> _repo;
+
+    public ReadDocumentDetailsQueryHandler(IRepository<Document> repo)
+    {
+        _repo = repo;
+    }
+
+    public async Task<DocumentDetailsDto?> Handle(ReadDocumentDetailsQuery query, CancellationToken cancel)
+    {
+        var docQuery = _repo.Query.AsNoTracking();
+
+        if (query.UserId is int userId)
+            docQuery = docQuery.Where(doc => doc.Envelope.UserId == userId);
+
+        // shortcut: manual select avoids AutoMapper ProjectTo pulling BYTE_DATA and the full navigation
+        // graph (Envelope → History → User etc.) which caused an extremely slow query (~87s).
+        // Annotations navigation is IEnumerable<T> on the entity (not ICollection<T>), so EF Core
+        // cannot translate it in a Select projection — we skip it entirely here; sender editor only
+        // needs element coordinates, not annotation payloads.
+        var raw = await docQuery
+            .Where(d => d.EnvelopeId == query.EnvelopeId)
+            .Select(d => new
+            {
+                d.Id,
+                d.EnvelopeId,
+                d.AddedWhen,
+                Elements = d.Elements == null ? null : d.Elements.Select(e => new
+                {
+                    e.Id,
+                    e.DocumentId,
+                    e.ReceiverId,
+                    e.ElementType,
+                    e.X,
+                    e.Y,
+                    e.Width,
+                    e.Height,
+                    e.Page,
+                    e.Required,
+                    e.Tooltip,
+                    e.ReadOnly,
+                    e.AnnotationIndex,
+                    e.AddedWhen,
+                    e.ChangedWhen,
+                    e.FullName,
+                    e.Position,
+                    e.Place,
+                }).ToList()
+            })
+            .FirstOrDefaultAsync(cancel);
+
+        if (raw is null)
+            return null;
+
+        return new DocumentDetailsDto
+        {
+            Id = raw.Id,
+            EnvelopeId = raw.EnvelopeId,
+            AddedWhen = raw.AddedWhen,
+            Elements = raw.Elements?.Select(e => new DocReceiverElementDto
+            {
+                Id = e.Id,
+                DocumentId = e.DocumentId,
+                ReceiverId = e.ReceiverId,
+                ElementType = e.ElementType,
+                X = e.X,
+                Y = e.Y,
+                Width = e.Width,
+                Height = e.Height,
+                Page = e.Page,
+                Required = e.Required,
+                Tooltip = e.Tooltip,
+                ReadOnly = e.ReadOnly,
+                AnnotationIndex = e.AnnotationIndex,
+                AddedWhen = e.AddedWhen,
+                ChangedWhen = e.ChangedWhen,
+                FullName = e.FullName,
+                Position = e.Position,
+                Place = e.Place,
+            })
+        };
+    }
+}

EnvelopeGenerator.Application/Documents/Queries/ReadDocumentDetailsQueryValidator.cs

@@ -0,0 +1,13 @@
+using FluentValidation;
+
+namespace EnvelopeGenerator.Application.Documents.Queries;
+
+public class ReadDocumentDetailsQueryValidator : AbstractValidator<ReadDocumentDetailsQuery>
+{
+    public ReadDocumentDetailsQueryValidator()
+    {
+        RuleFor(x => x.EnvelopeId)
+            .GreaterThan(0)
+            .WithMessage("EnvelopeId is required.");
+    }
+}

EnvelopeGenerator.Application/Documents/Queries/ReadDocumentQueryValidator.cs

@@ -0,0 +1,23 @@
+using FluentValidation;
+
+namespace EnvelopeGenerator.Application.Documents.Queries;
+
+public class ReadDocumentQueryValidator : AbstractValidator<ReadDocumentQuery>
+{
+    public ReadDocumentQueryValidator()
+    {
+        RuleFor(x => x)
+            .Must(x => (x.Id ?? 0) > 0 || (x.EnvelopeId ?? 0) > 0)
+            .WithMessage("Id or EnvelopeId is required.");
+
+        RuleFor(x => x.Id)
+            .GreaterThan(0)
+            .When(x => x.Id.HasValue)
+            .WithMessage("Id must be greater than 0.");
+
+        RuleFor(x => x.EnvelopeId)
+            .GreaterThan(0)
+            .When(x => x.EnvelopeId.HasValue)
+            .WithMessage("EnvelopeId must be greater than 0.");
+    }
+}

EnvelopeGenerator.Application/EnvelopeGenerator.Application.csproj

@@ -4,6 +4,7 @@
 		<TargetFrameworks>net7.0;net8.0;net9.0</TargetFrameworks>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
+		<LangVersion>latest</LangVersion>
 		<GenerateDocumentationFile>true</GenerateDocumentationFile>
 		<DocumentationFile>bin\$(Configuration)\$(TargetFramework)\$(AssemblyName).xml</DocumentationFile>
 	</PropertyGroup>
@@ -19,6 +20,8 @@
 		<PackageReference Include="DigitalData.Core.Client" Version="2.1.0" />
 		<PackageReference Include="DigitalData.Core.Exceptions" Version="1.1.0" />
 		<PackageReference Include="DigitalData.EmailProfilerDispatcher" Version="3.1.1" />
+		<PackageReference Include="FluentValidation" Version="11.11.0" />
+		<PackageReference Include="FluentValidation.DependencyInjectionExtensions" Version="11.11.0" />
 		<PackageReference Include="HtmlSanitizer" Version="9.0.892" />
 		<PackageReference Include="MediatR" Version="12.5.0" />
 		<PackageReference Include="Microsoft.Identity.Client" Version="4.82.1" />

EnvelopeGenerator.Application/EnvelopeReceivers/Commands/CreateEnvelopeReceiver/CreateEnvelopeReceiverCommand.cs

@@ -2,7 +2,7 @@
 using MediatR;
 using System.ComponentModel.DataAnnotations;
 
-namespace EnvelopeGenerator.Application.EnvelopeReceivers.Commands;
+namespace EnvelopeGenerator.Application.EnvelopeReceivers.Commands.CreateEnvelopeReceiver;
 
 /// <summary>
 /// Befehl zur Erstellung eines Umschlags.

EnvelopeGenerator.Application/EnvelopeReceivers/Commands/CreateEnvelopeReceiver/CreateEnvelopeReceiverCommandHandler.cs

@@ -4,7 +4,7 @@ using MediatR;
 using EnvelopeGenerator.Application.Common.Dto.Receiver;
 using EnvelopeGenerator.Application.Common.Interfaces.SQLExecutor;
 
-namespace EnvelopeGenerator.Application.EnvelopeReceivers.Commands;
+namespace EnvelopeGenerator.Application.EnvelopeReceivers.Commands.CreateEnvelopeReceiver;
 
 /// <summary>
 /// Handles the creation of an envelope along with its associated document and recipients.

EnvelopeGenerator.Application/EnvelopeReceivers/Commands/CreateEnvelopeReceiver/CreateEnvelopeReceiverResponse.cs

@@ -1,7 +1,7 @@
 using EnvelopeGenerator.Application.Common.Dto;
 using EnvelopeGenerator.Application.Common.Dto.Receiver;
 
-namespace EnvelopeGenerator.Application.EnvelopeReceivers.Commands;
+namespace EnvelopeGenerator.Application.EnvelopeReceivers.Commands.CreateEnvelopeReceiver;
 
 /// <summary>
 /// 

EnvelopeGenerator.Application/EnvelopeReceivers/Commands/RemoveEnvelopeReceiverCommand.cs

@@ -0,0 +1,84 @@
+using DigitalData.Core.Abstraction.Application.Repository;
+using DigitalData.Core.Exceptions;
+using EnvelopeGenerator.Domain.Constants;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Domain.Exceptions;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace EnvelopeGenerator.Application.EnvelopeReceivers.Commands;
+
+/// <summary>
+/// 
+/// </summary>
+public record RemoveEnvelopeReceiverCommand : IRequest
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public required int EnvelopeId { get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required int ReceiverId { get; init; }
+
+    internal int? UserId { get; private set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="userId"></param>
+    /// <returns></returns>
+    public RemoveEnvelopeReceiverCommand Authenticated(int userId)
+    {
+        UserId = userId;
+        return this;
+    }
+}
+
+/// <summary>
+/// 
+/// </summary>
+/// <param name="Repo"></param>
+public class RemoveEnvelopeReceiverCommandHandler(
+    IRepository<EnvelopeReceiver> Repo,
+    IRepository<DocReceiverElement> ElementRepo,
+    IRepository<ElementAnnotation> AnnotRepo) : IRequestHandler<RemoveEnvelopeReceiverCommand>
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="request"></param>
+    /// <param name="cancel"></param>
+    /// <returns></returns>
+    /// <exception cref="NotImplementedException"></exception>
+    public async Task Handle(RemoveEnvelopeReceiverCommand request, CancellationToken cancel)
+    {
+        var er = await Repo.Query
+            .Where(er => er.EnvelopeId == request.EnvelopeId && er.ReceiverId == request.ReceiverId)
+            .Include(er => er.Envelope)
+            .SingleOrDefaultAsync(cancel)
+                ?? throw new NotFoundException();
+
+        if (er.Envelope is null)
+            throw new InvalidOperationException($"In {nameof(RemoveEnvelopeReceiverCommandHandler)} EnvelopeReceiver.Envelope is null." +
+                $"This should not happen." +
+                $"EnvelopeId: {request.EnvelopeId}, ReceiverId: {request.ReceiverId}");
+
+        if (request.UserId is int userId && er.Envelope.UserId != userId)
+            throw new AuthorizationException("Cannot remove receiver from envelope that you do not own.");
+
+        if (er.Envelope.Status > EnvelopeStatus.EnvelopeSaved)
+            throw new ForbiddenException("Cannot remove receiver from envelope that is already processed.");
+
+        // 1. Delete all ElementAnnotations for this EnvelopeReceiver
+        await AnnotRepo.DeleteAsync(ann => ann.Element.Document.EnvelopeId == request.EnvelopeId && ann.Element.ReceiverId == request.ReceiverId, cancel);
+
+        // 2. Delete all DocReceiverElements for this EnvelopeReceiver
+        await ElementRepo.DeleteAsync(el => el.Document.EnvelopeId == request.EnvelopeId && el.ReceiverId == request.ReceiverId, cancel);
+
+        // 3. Delete the EnvelopeReceiver
+        await Repo.DeleteAsync(er => er.EnvelopeId == request.EnvelopeId && er.ReceiverId == request.ReceiverId, cancel);
+    }
+}

EnvelopeGenerator.Application/EnvelopeReceivers/MappingProfile.cs

@@ -16,5 +16,9 @@ public class MappingProfile : Profile
     public MappingProfile()
     {
         CreateMap<Receiver, ReceiverDto>();
+
+        CreateMap<EnvelopeReceiver, RecentReceiverSuggestionDto>()
+            .ForMember(dest => dest.FullName, opt => opt.MapFrom(src => src.Name))
+            .ForMember(dest => dest.EmailAddress, opt => opt.MapFrom(src => src.Receiver.EmailAddress));
     }
 }

EnvelopeGenerator.Application/EnvelopeReceivers/Queries/ReadEnvelopeReceiverSecretQuery.cs

@@ -21,7 +21,24 @@ namespace EnvelopeGenerator.Application.EnvelopeReceivers.Queries;
 /// </remarks>
 public record ReadEnvelopeReceiverSecretQuery
     : EnvelopeReceiverQueryBase<ReadEnvelopeQuery, ReadReceiverQuery>,
-      IRequest<EnvelopeReceiverSecretDto?>;
+      IRequest<EnvelopeReceiverSecretDto?>
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public ReadEnvelopeReceiverSecretQuery() { }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="envelopeId"></param>
+    /// <param name="receiverId"></param>
+    public ReadEnvelopeReceiverSecretQuery(int envelopeId, int receiverId)
+    {
+        Envelope.Id = envelopeId;
+        Receiver.Id = receiverId;
+    }
+}
 
 /// <summary>
 /// Extension methods for dispatching <see cref="ReadEnvelopeReceiverSecretQuery"/> via <see cref="IMediator"/>.

EnvelopeGenerator.Application/EnvelopeReceivers/Queries/ReadRecentReceiverSuggestionsQuery.cs

@@ -0,0 +1,98 @@
+using DigitalData.Core.Abstraction.Application.Repository;
+using EnvelopeGenerator.Application.Common.Dto.Receiver;
+using EnvelopeGenerator.Domain.Entities;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace EnvelopeGenerator.Application.EnvelopeReceivers.Queries;
+
+/// <summary>
+/// Reads recent receiver suggestions for envelope creation.
+/// </summary>
+/// <remarks>
+/// Sender scope is assigned via chain method to avoid exposing username mutation from API query binding.
+/// </remarks>
+public record ReadRecentReceiverSuggestionsQuery : IRequest<IReadOnlyList<RecentReceiverSuggestionDto>>
+{
+    /// <summary>
+    /// Sender username used for scoping suggestion results.
+    /// </summary>
+    internal string? Username { get; private init; }
+
+    /// <summary>
+    /// Desired number of results.
+    /// </summary>
+    public int? Take { get; init; } = null;
+
+    /// <summary>
+    /// Returns a new query instance scoped to the specified sender username.
+    /// </summary>
+    /// <param name="username">Sender username from authenticated claims.</param>
+    /// <returns>Scoped query instance.</returns>
+    public ReadRecentReceiverSuggestionsQuery ForSender(string username)
+    {
+        return this with { Username = username };
+    }
+}
+
+/// <summary>
+/// Handles <see cref="ReadRecentReceiverSuggestionsQuery"/>.
+/// </summary>
+public class ReadRecentReceiverSuggestionsQueryHandler(IRepository<EnvelopeReceiver> repository)
+    : IRequestHandler<ReadRecentReceiverSuggestionsQuery, IReadOnlyList<RecentReceiverSuggestionDto>>
+{
+    /// <summary>
+    /// Retrieves distinct recent receiver suggestions grouped by receiver email.
+    /// </summary>
+    /// <param name="request">Suggestion query.</param>
+    /// <param name="cancel">Cancellation token.</param>
+    /// <returns>Ordered list of recent receiver suggestions.</returns>
+    public async Task<IReadOnlyList<RecentReceiverSuggestionDto>> Handle(ReadRecentReceiverSuggestionsQuery request, CancellationToken cancel)
+    {
+        var query = repository.Query
+            .AsNoTracking()
+            .Where(er => er.Receiver != null);
+
+        if (request.Username is not null)
+            query = query.Where(er => er.Envelope != null && er.Envelope.User.Username == request.Username);
+
+        // 1) For each email, compute the latest usage timestamp.
+        var latestPerEmail = query
+            .GroupBy(er => er.Receiver!.EmailAddress)
+            .Select(g => new
+            {
+                EmailAddress = g.Key,
+                LastUsedAt = g.Max(er => er.AddedWhen),
+            });
+
+        // 2) Join back to rows that match the latest timestamp per email.
+        var latestRows =
+            from er in query
+            join latest in latestPerEmail
+                on new { EmailAddress = er.Receiver!.EmailAddress, LastUsedAt = er.AddedWhen }
+                equals new { latest.EmailAddress, latest.LastUsedAt }
+            select new
+            {
+                EmailAddress = er.Receiver!.EmailAddress,
+                FullName = er.Name,
+                LastUsedAt = er.AddedWhen,
+            };
+
+        // 3) Tie-break: if multiple rows share the same latest timestamp for an email,
+        // pick a deterministic name via Max(FullName), then order by most recent usage.
+        var suggestions = latestRows
+            .GroupBy(x => new { x.EmailAddress, x.LastUsedAt })
+            .Select(g => new RecentReceiverSuggestionDto
+            {
+                EmailAddress = g.Key.EmailAddress,
+                FullName = g.Max(x => x.FullName) ?? string.Empty,
+                LastUsedAt = g.Key.LastUsedAt,
+            })
+            .OrderByDescending(x => x.LastUsedAt)
+            .ThenBy(x => x.EmailAddress);
+
+        return request.Take is int take
+            ? await suggestions.Take(take).ToListAsync(cancel)
+            : await suggestions.ToListAsync(cancel);
+    }
+}

EnvelopeGenerator.Application/EnvelopeTypes/Queries/ReadEnvelopeTypesQuery.cs

@@ -1,6 +1,5 @@
 using EnvelopeGenerator.Application.Common.Dto;
 using MediatR;
-using AutoMapper;
 using DigitalData.Core.Abstraction.Application.Repository;
 using EnvelopeGenerator.Domain.Entities;
 using Microsoft.EntityFrameworkCore;
@@ -18,17 +17,14 @@ public record ReadEnvelopeTypesQuery : IRequest<IEnumerable<EnvelopeTypeDto>>;
 public class ReadEnvelopeTypesQueryHandler : IRequestHandler<ReadEnvelopeTypesQuery, IEnumerable<EnvelopeTypeDto>>
 {
     private readonly IRepository<EnvelopeType> _repository;
-    private readonly IMapper _mapper;
 
     /// <summary>
     /// 
     /// </summary>
     /// <param name="repository"></param>
-    /// <param name="mapper"></param>
-    public ReadEnvelopeTypesQueryHandler(IRepository<EnvelopeType> repository, IMapper mapper)
+    public ReadEnvelopeTypesQueryHandler(IRepository<EnvelopeType> repository)
     {
         _repository = repository;
-        _mapper = mapper;
     }
 
     /// <summary>
@@ -39,7 +35,28 @@ public class ReadEnvelopeTypesQueryHandler : IRequestHandler<ReadEnvelopeTypesQu
     /// <returns></returns>
     public async Task<IEnumerable<EnvelopeTypeDto>> Handle(ReadEnvelopeTypesQuery request, CancellationToken cancellationToken)
     {
-        var types = await _repository.Query.ToListAsync(cancellationToken);
-        return _mapper.Map<IEnumerable<EnvelopeTypeDto>>(types);
+        // TODO: Temporary manual projection to avoid null-materialization crashes from legacy nullable DB columns in EnvelopeType.
+        // Revisit and switch to AutoMapper query projection (ProjectTo) after schema nullability and mapping contracts are stabilized.
+        return await _repository.Query
+            .AsNoTracking()
+            .Select(t => new EnvelopeTypeDto
+            {
+                Id = t.Id,
+                Title = t.Title ?? string.Empty,
+                Language = string.IsNullOrWhiteSpace(t.Language) ? "de-DE" : t.Language,
+                ExpiresDays = t.ExpiresDays,
+                CertificationType = t.CertificationType,
+                UseAccessCode = t.UseAccessCode,
+                FinalEmailToCreator = (int?)t.FinalEmailToCreator,
+                FinalEmailToReceivers = (int?)t.FinalEmailToReceivers,
+                AddedWhen = t.AddedWhen,
+                ChangedWhen = t.ChangedWhen,
+                ExpiresWarningDays = t.ExpiresWarningDays,
+                SendReminderEmails = t.SendReminderEmails,
+                FirstReminderDays = t.FirstReminderDays,
+                ReminderIntervalDays = t.ReminderIntervalDays,
+                ContractType = t.ContractType
+            })
+            .ToListAsync(cancellationToken);
     }
 }

EnvelopeGenerator.Application/Envelopes/Commands/CreateEnvelopeCommand.cs

@@ -1,5 +1,6 @@
 using EnvelopeGenerator.Application.Common.Dto;
 using EnvelopeGenerator.Application.Common.Interfaces.SQLExecutor;
+using EnvelopeGenerator.Domain.Constants;
 using MediatR;
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
@@ -12,8 +13,66 @@ namespace EnvelopeGenerator.Application.Envelopes.Commands;
 /// </summary>
 public record CreateEnvelopeCommand : IRequest<EnvelopeDto?>
 {
+    /// <summary>
+    /// Optionale Umschlag-ID fuer Aktualisierungsvorgaenge.
+    /// </summary>
     public int? EnvelopeId { get; init; }
 
+    /// <summary>
+    /// Kennung des ausgewaehlten Umschlagtyps (Vorlage).
+    /// </summary>
+    public int? EnvelopeTypeId { get; set; }
+
+    /// <summary>
+    /// Sprachcode fuer Umschlaginhalt und Benachrichtigungen.
+    /// </summary>
+    public string? Language { get; set; }
+
+    /// <summary>
+    /// Gibt an, ob der Zugriffscode fuer Empfaenger aktiviert ist.
+    /// </summary>
+    public bool? UseAccessCode { get; set; }
+
+    /// <summary>
+    /// Zertifizierungstyp fuer den Signaturprozess.
+    /// </summary>
+    public CertificationType? CertificationType { get; set; }
+
+    /// <summary>
+    /// Finale E-Mail-Einstellung fuer den Ersteller.
+    /// </summary>
+    public int? FinalEmailToCreator { get; set; }
+
+    /// <summary>
+    /// Finale E-Mail-Einstellung fuer die Empfaenger.
+    /// </summary>
+    public int? FinalEmailToReceivers { get; set; }
+
+    /// <summary>
+    /// Gibt an, ob Erinnerungs-E-Mails aktiviert sind.
+    /// </summary>
+    public bool? SendReminderEmails { get; set; }
+
+    /// <summary>
+    /// Anzahl der Tage bis zur ersten Erinnerung.
+    /// </summary>
+    public int? FirstReminderDays { get; set; }
+
+    /// <summary>
+    /// Intervall in Tagen zwischen Erinnerungs-E-Mails.
+    /// </summary>
+    public int? ReminderIntervalDays { get; set; }
+
+    /// <summary>
+    /// Anzahl der Tage bis zum Ablauf des Umschlags.
+    /// </summary>
+    public int? ExpiresWhenDays { get; set; }
+
+    /// <summary>
+    /// Anzahl der Tage vor Ablauf, ab denen gewarnt wird.
+    /// </summary>
+    public int? ExpiresWarningWhenDays { get; set; }
+
     /// <summary>
     /// Der Titel des Umschlags. Dies ist ein Pflichtfeld.
     /// </summary>
@@ -29,10 +88,19 @@ public record CreateEnvelopeCommand : IRequest<EnvelopeDto?>
     /// </summary>
     public bool TFAEnabled { get; set; } = false;
 
+    /// <summary>
+    /// Gibt an, ob der Umschlag nach dem Speichern sofort versendet werden soll.
+    /// </summary>
     public bool Send { get; init; }
 
+    /// <summary>
+    /// Optionaler PDF-Dokumentinhalt als Base64.
+    /// </summary>
     public CreateEnvelopeDocumentDto? Document { get; init; }
 
+    /// <summary>
+    /// Empfaengerliste inklusive optionaler Signaturfeld-Koordinaten.
+    /// </summary>
     public List<CreateEnvelopeReceiverDto> Receivers { get; init; } = new();
 
     /// <summary>
@@ -62,10 +130,27 @@ public record CreateEnvelopeCommand : IRequest<EnvelopeDto?>
     public bool UseSQLExecutor { get; set; } = true;
 }
 
+/// <summary>
+/// 
+/// </summary>
+/// <param name="DataAsBase64"></param>
 public record CreateEnvelopeDocumentDto(string DataAsBase64);
 
+/// <summary>
+/// 
+/// </summary>
+/// <param name="X"></param>
+/// <param name="Y"></param>
+/// <param name="Page"></param>
 public record CreateEnvelopeFieldDto(double X, double Y, int Page);
 
+/// <summary>
+/// 
+/// </summary>
+/// <param name="EmailAddress"></param>
+/// <param name="Name"></param>
+/// <param name="PhoneNumber"></param>
+/// <param name="Fields"></param>
 public record CreateEnvelopeReceiverDto(
     string EmailAddress,
     string? Name,

EnvelopeGenerator.Application/Envelopes/Commands/CreateEnvelopeCommandHandler.cs

@@ -1,66 +1,66 @@
 using AutoMapper;
-using MediatR;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
 using DigitalData.Core.Abstraction.Application.Repository;
-using DigitalData.EmailProfilerDispatcher.Abstraction.Entities;
 using DigitalData.Core.Exceptions;
-using EnvelopeGenerator.Domain.Entities;
-using EnvelopeGenerator.Application.Common.Dto;
+using DigitalData.EmailProfilerDispatcher.Abstraction.Entities;
+using DigitalData.UserManager.Domain.Entities;
 using EnvelopeGenerator.Application.Common.Configurations;
+using EnvelopeGenerator.Application.Common.Dto;
 using EnvelopeGenerator.Application.Common.Extensions;
+using EnvelopeGenerator.Application.Common.Interfaces;
 using EnvelopeGenerator.Application.Common.Interfaces.Services;
+using EnvelopeGenerator.Application.Common.Interfaces.Services.Notification;
 using EnvelopeGenerator.Application.Common.Interfaces.SQLExecutor;
 using EnvelopeGenerator.Application.Histories.Commands;
-using EnvelopeGenerator.Domain.Constants;
 using EnvelopeGenerator.Domain;
+using EnvelopeGenerator.Domain.Constants;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Domain.Interfaces;
+using MediatR;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
 
 namespace EnvelopeGenerator.Application.Envelopes.Commands;
 
 /// <summary>
 /// 
 /// </summary>
-public class CreateEnvelopeCommandHandler : IRequestHandler<CreateEnvelopeCommand, EnvelopeDto?>
+/// <param name="Provider"></param>
+/// <param name="Mapper"></param>
+/// <param name="EnvNtfService"></param>
+/// <param name="ReqCntxt"></param>
+/// <param name="Logger"></param>
+public class CreateEnvelopeCommandHandler(IServiceProvider Provider, IMapper Mapper, IEnvelopeNotificationService EnvNtfService, IRequestContext ReqCntxt, ILogger<CreateEnvelopeCommandHandler> Logger) : IRequestHandler<CreateEnvelopeCommand, EnvelopeDto?>
 {
-    private readonly IServiceProvider _provider;
+    private IEnvelopeExecutor Executor => Provider.GetRequiredService<IEnvelopeExecutor>();
 
-    private IEnvelopeExecutor Executor => _provider.GetRequiredService<IEnvelopeExecutor>();
+    private IRepository<Envelope> Repository => Provider.GetRequiredService<IRepository<Envelope>>();
 
-    private IRepository<Envelope> Repository => _provider.GetRequiredService<IRepository<Envelope>>();
+    private IRepository<Document> DocumentRepository => Provider.GetRequiredService<IRepository<Document>>();
 
-    private IRepository<Document> DocumentRepository => _provider.GetRequiredService<IRepository<Document>>();
+    private IRepository<EnvelopeReceiver> EnvelopeReceiverRepository => Provider.GetRequiredService<IRepository<EnvelopeReceiver>>();
 
-    private IRepository<EnvelopeReceiver> EnvelopeReceiverRepository => _provider.GetRequiredService<IRepository<EnvelopeReceiver>>();
+    private IRepository<EnvelopeType> EnvelopeTypeRepository => Provider.GetRequiredService<IRepository<EnvelopeType>>();
 
-    private IRepository<Receiver> ReceiverRepository => _provider.GetRequiredService<IRepository<Receiver>>();
+    private IRepository<Receiver> ReceiverRepository => Provider.GetRequiredService<IRepository<Receiver>>();
 
-    private IRepository<DocReceiverElement> DocReceiverElementRepository => _provider.GetRequiredService<IRepository<DocReceiverElement>>();
+    private IRepository<DocReceiverElement> DocReceiverElementRepository => Provider.GetRequiredService<IRepository<DocReceiverElement>>();
 
-    private IRepository<EmailTemplate> EmailTemplateRepository => _provider.GetRequiredService<IRepository<EmailTemplate>>();
+    private IRepository<EmailTemplate> EmailTemplateRepository => Provider.GetRequiredService<IRepository<EmailTemplate>>();
 
-    private IRepository<EmailOut> EmailOutRepository => _provider.GetRequiredService<IRepository<EmailOut>>();
+    private IRepository<EmailOut> EmailOutRepository => Provider.GetRequiredService<IRepository<EmailOut>>();
 
-    private MailParams MailParams => _provider.GetRequiredService<IOptions<MailParams>>().Value;
+    private MailParams MailParams => Provider.GetRequiredService<IOptions<MailParams>>().Value;
 
-    private DispatcherParams DispatcherParams => _provider.GetRequiredService<IOptions<DispatcherParams>>().Value;
+    private DispatcherParams DispatcherParams => Provider.GetRequiredService<IOptions<DispatcherParams>>().Value;
 
-    private IConfigService ConfigService => _provider.GetRequiredService<IConfigService>();
+    private SignatureFieldParams SignatureFieldParams => Provider.GetRequiredService<IOptionsMonitor<SignatureFieldParams>>().CurrentValue;
 
-    private IMediator Mediator => _provider.GetRequiredService<IMediator>();
+    [Obsolete("Use IConfigService instead.")]
+    private IConfigService ConfigService => Provider.GetRequiredService<IConfigService>();
 
-    private readonly IMapper _mapper;
-
-    /// <summary>
-    /// 
-    /// </summary>
-    /// <param name="provider"></param>
-    /// <param name="mapper"></param>
-    public CreateEnvelopeCommandHandler(IServiceProvider provider, IMapper mapper)
-    {
-        _provider = provider;
-        _mapper = mapper;
-    }
+    private IMediator Mediator => Provider.GetRequiredService<IMediator>();
 
     /// <summary>
     /// 
@@ -73,6 +73,7 @@ public class CreateEnvelopeCommandHandler : IRequestHandler<CreateEnvelopeComman
         var now = DateTime.Now;
         var title = request.Title?.Trim() ?? string.Empty;
         var message = request.Message?.Trim() ?? string.Empty;
+        var settings = await ResolveEnvelopeSettingsAsync(request, existing: null, cancel);
 
         Envelope envelope;
         if (request.EnvelopeId is int envelopeId)
@@ -85,11 +86,27 @@ public class CreateEnvelopeCommandHandler : IRequestHandler<CreateEnvelopeComman
             if (envelope.UserId != request.UserId)
                 throw new ForbiddenException();
 
+            settings = await ResolveEnvelopeSettingsAsync(request, envelope, cancel);
+
             await Repository.UpdateAsync(e =>
             {
                 e.Title = title;
                 e.Message = message;
                 e.TfaEnabled = request.TFAEnabled;
+                e.EnvelopeTypeId = settings.EnvelopeTypeId;
+                e.Language = settings.Language;
+                e.UseAccessCode = settings.UseAccessCode;
+                e.CertificationType = settings.CertificationType;
+                e.FinalEmailToCreator = settings.FinalEmailToCreator;
+                e.FinalEmailToReceivers = settings.FinalEmailToReceivers;
+                e.SendReminderEmails = settings.SendReminderEmails;
+                e.FirstReminderDays = settings.FirstReminderDays;
+                e.ReminderIntervalDays = settings.ReminderIntervalDays;
+                e.ExpiresWhenDays = settings.ExpiresWhenDays;
+                e.ExpiresWarningWhenDays = settings.ExpiresWarningWhenDays;
+                e.ContractType = settings.ContractType;
+                e.ExpiresWhen = settings.ExpiresWhen;
+                e.ExpiresWarningWhen = settings.ExpiresWarningWhen;
                 e.Status = EnvelopeStatus.EnvelopeSaved;
                 e.ChangedWhen = now;
             }, e => e.Id == envelopeId, cancel);
@@ -97,6 +114,20 @@ public class CreateEnvelopeCommandHandler : IRequestHandler<CreateEnvelopeComman
             envelope.Title = title;
             envelope.Message = message;
             envelope.TfaEnabled = request.TFAEnabled;
+            envelope.EnvelopeTypeId = settings.EnvelopeTypeId;
+            envelope.Language = settings.Language;
+            envelope.UseAccessCode = settings.UseAccessCode;
+            envelope.CertificationType = settings.CertificationType;
+            envelope.FinalEmailToCreator = settings.FinalEmailToCreator;
+            envelope.FinalEmailToReceivers = settings.FinalEmailToReceivers;
+            envelope.SendReminderEmails = settings.SendReminderEmails;
+            envelope.FirstReminderDays = settings.FirstReminderDays;
+            envelope.ReminderIntervalDays = settings.ReminderIntervalDays;
+            envelope.ExpiresWhenDays = settings.ExpiresWhenDays;
+            envelope.ExpiresWarningWhenDays = settings.ExpiresWarningWhenDays;
+            envelope.ContractType = settings.ContractType;
+            envelope.ExpiresWhen = settings.ExpiresWhen;
+            envelope.ExpiresWarningWhen = settings.ExpiresWarningWhen;
             envelope.Status = EnvelopeStatus.EnvelopeSaved;
             envelope.ChangedWhen = now;
         }
@@ -114,12 +145,69 @@ public class CreateEnvelopeCommandHandler : IRequestHandler<CreateEnvelopeComman
                     AddedWhen = now,
                     ChangedWhen = now,
                     Comment = string.Empty,
-                    Language = "de-DE",
+                    EnvelopeTypeId = settings.EnvelopeTypeId,
+                    Language = settings.Language,
                     TfaEnabled = request.TFAEnabled,
-                    UseAccessCode = false,
-                    SendReminderEmails = false
+                    UseAccessCode = settings.UseAccessCode,
+                    CertificationType = settings.CertificationType,
+                    FinalEmailToCreator = settings.FinalEmailToCreator,
+                    FinalEmailToReceivers = settings.FinalEmailToReceivers,
+                    SendReminderEmails = settings.SendReminderEmails,
+                    FirstReminderDays = settings.FirstReminderDays,
+                    ReminderIntervalDays = settings.ReminderIntervalDays,
+                    ExpiresWhenDays = settings.ExpiresWhenDays,
+                    ExpiresWarningWhenDays = settings.ExpiresWarningWhenDays,
+                    ExpiresWhen = settings.ExpiresWhen,
+                    ExpiresWarningWhen = settings.ExpiresWarningWhen,
+                    ContractType = settings.ContractType
                 }, cancel);
 
+            if (request.UseSQLExecutor)
+            {
+                await Repository.UpdateAsync(e =>
+                {
+                    e.Title = title;
+                    e.Message = message;
+                    e.TfaEnabled = request.TFAEnabled;
+                    e.EnvelopeTypeId = settings.EnvelopeTypeId;
+                    e.Language = settings.Language;
+                    e.UseAccessCode = settings.UseAccessCode;
+                    e.CertificationType = settings.CertificationType;
+                    e.FinalEmailToCreator = settings.FinalEmailToCreator;
+                    e.FinalEmailToReceivers = settings.FinalEmailToReceivers;
+                    e.SendReminderEmails = settings.SendReminderEmails;
+                    e.FirstReminderDays = settings.FirstReminderDays;
+                    e.ReminderIntervalDays = settings.ReminderIntervalDays;
+                    e.ExpiresWhenDays = settings.ExpiresWhenDays;
+                    e.ExpiresWarningWhenDays = settings.ExpiresWarningWhenDays;
+                    e.ExpiresWhen = settings.ExpiresWhen;
+                    e.ExpiresWarningWhen = settings.ExpiresWarningWhen;
+                    e.ContractType = settings.ContractType;
+                    e.Status = EnvelopeStatus.EnvelopeSaved;
+                    e.ChangedWhen = now;
+                }, e => e.Id == envelope.Id, cancel);
+
+                envelope.Title = title;
+                envelope.Message = message;
+                envelope.TfaEnabled = request.TFAEnabled;
+                envelope.EnvelopeTypeId = settings.EnvelopeTypeId;
+                envelope.Language = settings.Language;
+                envelope.UseAccessCode = settings.UseAccessCode;
+                envelope.CertificationType = settings.CertificationType;
+                envelope.FinalEmailToCreator = settings.FinalEmailToCreator;
+                envelope.FinalEmailToReceivers = settings.FinalEmailToReceivers;
+                envelope.SendReminderEmails = settings.SendReminderEmails;
+                envelope.FirstReminderDays = settings.FirstReminderDays;
+                envelope.ReminderIntervalDays = settings.ReminderIntervalDays;
+                envelope.ExpiresWhenDays = settings.ExpiresWhenDays;
+                envelope.ExpiresWarningWhenDays = settings.ExpiresWarningWhenDays;
+                envelope.ExpiresWhen = settings.ExpiresWhen;
+                envelope.ExpiresWarningWhen = settings.ExpiresWarningWhen;
+                envelope.ContractType = settings.ContractType;
+                envelope.Status = EnvelopeStatus.EnvelopeSaved;
+                envelope.ChangedWhen = now;
+            }
+
             await Mediator.Send(new CreateHistoryCommand
             {
                 EnvelopeId = envelope.Id,
@@ -140,9 +228,108 @@ public class CreateEnvelopeCommandHandler : IRequestHandler<CreateEnvelopeComman
                 .ThenInclude(er => er.Receiver)
             .FirstAsync(e => e.Id == envelope.Id, cancel);
 
-        return _mapper.Map<EnvelopeDto>(envelope);
+        return Mapper.Map<EnvelopeDto>(envelope);
     }
 
+    private async Task<EnvelopeSettings> ResolveEnvelopeSettingsAsync(CreateEnvelopeCommand request, Envelope? existing, CancellationToken cancel)
+    {
+        EnvelopeType? selectedType = null;
+        if (request.EnvelopeTypeId is int envelopeTypeId && envelopeTypeId > 0)
+        {
+            selectedType = await EnvelopeTypeRepository.Query
+                .FirstOrDefaultAsync(t => t.Id == envelopeTypeId, cancel)
+                ?? throw new BadRequestException($"Envelope type {envelopeTypeId} not found.");
+        }
+
+        var expiresWhenDays = Math.Max(0,
+            request.ExpiresWhenDays
+            ?? selectedType?.ExpiresWhenDays
+            ?? existing?.ExpiresWhenDays
+            ?? 0);
+
+        var expiresWarningWhenDays = Math.Max(0,
+            request.ExpiresWarningWhenDays
+            ?? selectedType?.ExpiresWarningWhenDays
+            ?? existing?.ExpiresWarningWhenDays
+            ?? 0);
+
+        var useAccessCode = request.UseAccessCode
+            ?? selectedType?.UseAccessCode
+            ?? existing?.UseAccessCode
+            ?? false;
+
+        if (request.TFAEnabled)
+            useAccessCode = true;
+
+        return new EnvelopeSettings(
+            EnvelopeTypeId: request.EnvelopeTypeId ?? existing?.EnvelopeTypeId,
+            Language: ResolveLanguage(request.Language, selectedType?.Language, existing?.Language),
+            UseAccessCode: useAccessCode,
+            CertificationType: request.CertificationType
+                ?? selectedType?.CertificationType
+                ?? existing?.CertificationType
+                ?? CertificationType.AdvancedElectronicSignature,
+            FinalEmailToCreator: request.FinalEmailToCreator
+                ?? (int?)selectedType?.FinalEmailToCreator
+                ?? existing?.FinalEmailToCreator
+                ?? (int)FinalEmailType.No,
+            FinalEmailToReceivers: request.FinalEmailToReceivers
+                ?? (int?)selectedType?.FinalEmailToReceivers
+                ?? existing?.FinalEmailToReceivers
+                ?? (int)FinalEmailType.No,
+            SendReminderEmails: request.SendReminderEmails
+                ?? selectedType?.SendReminderEmails
+                ?? existing?.SendReminderEmails
+                ?? false,
+            FirstReminderDays: Math.Max(0,
+                request.FirstReminderDays
+                ?? selectedType?.FirstReminderDays
+                ?? existing?.FirstReminderDays
+                ?? 0),
+            ReminderIntervalDays: Math.Max(0,
+                request.ReminderIntervalDays
+                ?? selectedType?.ReminderIntervalDays
+                ?? existing?.ReminderIntervalDays
+                ?? 0),
+            ExpiresWhenDays: expiresWhenDays,
+            ExpiresWarningWhenDays: expiresWarningWhenDays,
+            ExpiresWhen: expiresWhenDays > 0 ? DateTime.Now.AddDays(expiresWhenDays) : null,
+            ExpiresWarningWhen: expiresWarningWhenDays > 0 ? DateTime.Now.AddDays(expiresWarningWhenDays) : null,
+            ContractType: existing?.ContractType
+                ?? selectedType?.ContractType
+                ?? ContractType.Contract);
+    }
+
+    private static string ResolveLanguage(string? preferred, string? fallback1, string? fallback2)
+    {
+        if (!string.IsNullOrWhiteSpace(preferred))
+            return preferred.Trim();
+
+        if (!string.IsNullOrWhiteSpace(fallback1))
+            return fallback1.Trim();
+
+        if (!string.IsNullOrWhiteSpace(fallback2))
+            return fallback2.Trim();
+
+        return "de-DE";
+    }
+
+    private sealed record EnvelopeSettings(
+        int? EnvelopeTypeId,
+        string Language,
+        bool UseAccessCode,
+        CertificationType CertificationType,
+        int FinalEmailToCreator,
+        int FinalEmailToReceivers,
+        bool SendReminderEmails,
+        int FirstReminderDays,
+        int ReminderIntervalDays,
+        int ExpiresWhenDays,
+        int ExpiresWarningWhenDays,
+        DateTime? ExpiresWhen,
+        DateTime? ExpiresWarningWhen,
+        ContractType ContractType);
+
     private async Task<string> ResolveSenderReferenceAsync(Envelope envelope, CancellationToken cancel)
     {
         if (!string.IsNullOrWhiteSpace(envelope.User?.Email))
@@ -255,8 +442,8 @@ public class CreateEnvelopeCommandHandler : IRequestHandler<CreateEnvelopeComman
                     ElementType = 1,
                     X = field.X,
                     Y = field.Y,
-                    Width = 1.77,
-                    Height = 1.96,
+                    Width = SignatureFieldParams.Width,
+                    Height = SignatureFieldParams.Height,
                     Page = field.Page,
                     Required = true,
                     ReadOnly = false,
@@ -340,15 +527,15 @@ public class CreateEnvelopeCommandHandler : IRequestHandler<CreateEnvelopeComman
         if (!hasDocument)
             throw new BadRequestException("Cannot send envelope without a document.");
 
-        var links = await EnvelopeReceiverRepository.Query
+        var envRcvs = await EnvelopeReceiverRepository.Query
             .Include(er => er.Receiver)
             .Where(er => er.EnvelopeId == envelope.Id)
             .ToListAsync(cancel);
 
-        if (links.Count == 0)
+        if (envRcvs.Count == 0)
             throw new BadRequestException("Cannot send envelope without receivers.");
 
-        var receiverIds = links.Select(l => l.ReceiverId).Distinct().ToList();
+        var receiverIds = envRcvs.Select(l => l.ReceiverId).Distinct().ToList();
         var documentIds = await DocumentRepository.Query
             .Where(d => d.EnvelopeId == envelope.Id)
             .Select(d => d.Id)
@@ -361,7 +548,7 @@ public class CreateEnvelopeCommandHandler : IRequestHandler<CreateEnvelopeComman
             .Select(g => new { ReceiverId = g.Key, Count = g.Count() })
             .ToDictionaryAsync(x => x.ReceiverId, x => x.Count, cancel);
 
-        var receiversWithoutFields = links
+        var receiversWithoutFields = envRcvs
             .Where(link => !receiverFieldCounts.TryGetValue(link.ReceiverId, out var count) || count <= 0)
             .Select(link => link.Name)
             .ToList();
@@ -385,70 +572,39 @@ public class CreateEnvelopeCommandHandler : IRequestHandler<CreateEnvelopeComman
             Status = EnvelopeStatus.EnvelopeQueued
         }, cancel);
 
-        await QueueInvitationEmailsAsync(envelope, links, userReference, cancel);
+        await SendInvitationEmailsAsync(envelope, envRcvs, cancel);
 
         envelope.Status = EnvelopeStatus.EnvelopeQueued;
     }
 
-    private async Task QueueInvitationEmailsAsync(
+    private async Task SendInvitationEmailsAsync(
         Envelope envelope,
-        IReadOnlyCollection<EnvelopeReceiver> links,
-        string senderReference,
+        IReadOnlyCollection<EnvelopeReceiver> envRcvs,
         CancellationToken cancel)
     {
-        var template = await EmailTemplateRepository.Query
-            .SingleOrDefaultAsync(x => x.Name == EmailTemplateType.DocumentReceived.ToString(), cancel)
-            ?? throw new InvalidOperationException($"Email template not found: {EmailTemplateType.DocumentReceived}");
-
-        var signatureHost = await ConfigService.ReadDefaultSignatureHost();
-        var senderName = senderReference;
-
-        foreach (var link in links)
+        foreach (var er in envRcvs)
         {
-            var receiver = link.Receiver;
-            if (receiver is null || string.IsNullOrWhiteSpace(receiver.EmailAddress) || string.IsNullOrWhiteSpace(receiver.Signature))
-                continue;
-
-            var envelopeKey = (envelope.Uuid, receiver.Signature).ToEnvelopeKey();
-            var documentLink = $"{signatureHost.TrimEnd('/')}/envelope/login/{Uri.EscapeDataString(envelopeKey)}";
-
-            var placeholders = new Dictionary<string, string>(MailParams.Placeholders)
+            var advancedSignature = envelope.CertificationType == CertificationType.AdvancedElectronicSignature;
+            var origin = new Uri(ReqCntxt.Origin ?? throw new InvalidOperationException($"The request origin is missing in {nameof(CreateEnvelopeCommandHandler)}."));
+            try
             {
-                ["[NAME_RECEIVER]"] = link.Name ?? string.Empty,
-                ["[NAME_SENDER]"] = senderName ?? string.Empty,
-                ["[DOCUMENT_TITLE]"] = envelope.Title ?? string.Empty,
-                ["[MESSAGE]"] = envelope.Message ?? string.Empty,
-                ["[LINK_TO_DOCUMENT]"] = documentLink,
-                ["[LINK_TO_DOCUMENT_TEXT]"] = documentLink[..Math.Min(40, documentLink.Length)] + ".."
-            };
-
-            var subject = ReplacePlaceHolders(template.Subject, placeholders);
-            var body = ReplacePlaceHolders(template.Body, placeholders);
-
-            var emailOut = new EmailOut
+                await EnvNtfService.Notify(er.Receiver.EmailAddress, new DocumentReceivedNotification
+                {
+                    AdvancedSignature = advancedSignature,
+                    DocumentTitle = envelope.Title ?? string.Empty,
+                    NameReceiver = er.Name ?? string.Empty,
+                    EnvelopeUuid = envelope.Uuid,
+                    IsReadAndConfirm = envelope.IsReadAndConfirm(),
+                    Message = envelope.Message ?? string.Empty,
+                    NameSender = $"{envelope.User.Prename} {envelope.User.Name}",
+                    Origin = origin,
+                    ReceiverSignature = er.Receiver.Signature,
+                }, cancel);
+            }
+            catch(Exception ex)
             {
-                EmailAddress = receiver.EmailAddress,
-                EmailSubj = subject,
-                EmailBody = body,
-                AddedWhen = DateTime.Now,
-                AddedWho = DispatcherParams.AddedWho,
-                SendingProfile = DispatcherParams.SendingProfile,
-                ReminderTypeId = DispatcherParams.ReminderTypeId,
-                EmailAttmt1 = DispatcherParams.EmailAttmt1,
-                WfId = (int)EnvelopeStatus.MessageInvitationSent,
-                ReferenceString = receiver.EmailAddress,
-                ReferenceId = link.ReceiverId
-            };
-
-            await EmailOutRepository.CreateAsync(emailOut, cancel);
+                Logger.LogError(ex, "Failed to send invitation email for receiver {emailAddress} in envelope {envelopeId}.", er.Receiver.EmailAddress, envelope.Id);
+            }
         }
     }
-
-    private static string ReplacePlaceHolders(string text, Dictionary<string, string> placeHolders)
-    {
-        foreach (var placeHolder in placeHolders)
-            text = text.Replace(placeHolder.Key, placeHolder.Value);
-
-        return text;
-    }
 }

EnvelopeGenerator.Application/Envelopes/MappingProfile.cs

@@ -1,5 +1,5 @@
 using AutoMapper;
-using EnvelopeGenerator.Application.EnvelopeReceivers.Commands;
+using EnvelopeGenerator.Application.EnvelopeReceivers.Commands.CreateEnvelopeReceiver;
 using EnvelopeGenerator.Application.Envelopes.Commands;
 using EnvelopeGenerator.Domain.Entities;
 

EnvelopeGenerator.Application/Envelopes/Queries/ReadEnvelopeQuery.cs

@@ -2,6 +2,9 @@
 using EnvelopeGenerator.Domain.Constants;
 using EnvelopeGenerator.Application.Common.Query;
 using EnvelopeGenerator.Application.Common.Dto;
+using EnvelopeGenerator.Application.Common.Dto.EnvelopeReceiver;
+using EnvelopeGenerator.Application.Common.Dto.History;
+using EnvelopeGenerator.Application.Common.Dto.Receiver;
 using AutoMapper;
 using DigitalData.Core.Abstraction.Application.Repository;
 using EnvelopeGenerator.Domain.Entities;
@@ -14,6 +17,11 @@ namespace EnvelopeGenerator.Application.Envelopes.Queries;
 /// </summary>
 public record ReadEnvelopeQuery : EnvelopeQueryBase, IRequest<IEnumerable<EnvelopeDto>>
 {
+    /// <summary>
+    /// 
+    /// </summary>
+    public bool IncludeDocAndDocRes { get; init; } = true;
+
     /// <summary>
     /// 
     /// </summary>
@@ -148,6 +156,86 @@ public class ReadEnvelopeQueryHandler : IRequestHandler<ReadEnvelopeQuery, IEnum
         if (request is { OnlyCompleted: true })
             query = query.Where(e => Status.Completed.Contains(e.Status));
 
+        if (!request.IncludeDocAndDocRes)
+        {
+            return await query
+                .Select(e => new EnvelopeDto
+                {
+                    Id = e.Id,
+                    UserId = e.UserId,
+                    Status = e.Status,
+                    StatusName = string.Empty,
+                    Uuid = e.Uuid,
+                    Message = e.Message,
+                    AddedWhen = e.AddedWhen,
+                    ChangedWhen = e.ChangedWhen,
+                    Title = e.Title ?? string.Empty,
+                    ContractType = e.ContractType,
+                    Language = e.Language,
+                    EnvelopeTypeId = e.EnvelopeTypeId,
+                    CertificationType = e.CertificationType,
+                    FinalEmailToCreator = e.FinalEmailToCreator,
+                    FinalEmailToReceivers = e.FinalEmailToReceivers,
+                    SendReminderEmails = e.SendReminderEmails,
+                    FirstReminderDays = e.FirstReminderDays,
+                    ReminderIntervalDays = e.ReminderIntervalDays,
+                    ExpiresWhenDays = e.ExpiresWhenDays,
+                    ExpiresWarningWhenDays = e.ExpiresWarningWhenDays,
+                    UseAccessCode = e.UseAccessCode ?? true,
+                    TFAEnabled = e.TfaEnabled ?? false,
+                    EnvelopeTypeTitle = e.Type != null ? e.Type.Title : null,
+                    IsAlreadySent = false,
+                    DocResult = null,
+                    Documents = null,
+                    EnvelopeReceivers = e.EnvelopeReceivers.Select(er => new EnvelopeReceiverDto
+                    {
+                        EnvelopeId = er.EnvelopeId,
+                        ReceiverId = er.ReceiverId,
+                        Sequence = er.Sequence,
+                        Name = er.Name,
+                        JobTitle = er.JobTitle,
+                        CompanyName = er.CompanyName,
+                        PrivateMessage = er.PrivateMessage,
+                        AccessCode = er.AccessCode,
+                        AddedWhen = er.AddedWhen,
+                        ChangedWhen = er.ChangedWhen,
+                        HasPhoneNumber = er.HasPhoneNumber,
+                        Receiver = er.Receiver == null
+                            ? null
+                            : new ReceiverDto
+                            {
+                                Id = er.Receiver.Id,
+                                EmailAddress = er.Receiver.EmailAddress,
+                                Signature = er.Receiver.Signature,
+                                AddedWhen = er.Receiver.AddedWhen,
+                                TfaRegDeadline = er.Receiver.TfaRegDeadline
+                            }
+                    }),
+                    Histories = e.Histories.Select(h => new HistoryDto
+                    {
+                        Id = h.Id,
+                        EnvelopeId = h.EnvelopeId,
+                        UserReference = h.UserReference,
+                        Status = h.Status,
+                        StatusName = null,
+                        AddedWhen = h.AddedWhen,
+                        ActionDate = h.ActionDate,
+                        Comment = h.Comment,
+                        Receiver = h.Receiver == null
+                            ? null
+                            : new ReceiverDto
+                            {
+                                Id = h.Receiver.Id,
+                                EmailAddress = h.Receiver.EmailAddress,
+                                Signature = h.Receiver.Signature,
+                                AddedWhen = h.Receiver.AddedWhen,
+                                TfaRegDeadline = h.Receiver.TfaRegDeadline
+                            }
+                    })
+                })
+                .ToListAsync(cancel);
+        }
+
         var envelopes = await query
             .Include(e => e.Type)
             .Include(e => e.EnvelopeReceivers).ThenInclude(er => er.Receiver)

EnvelopeGenerator.Application/Envelopes/Queries/ReadSignedEnvelopeQuery.cs

@@ -0,0 +1,62 @@
+using AutoMapper;
+using DigitalData.Core.Abstraction.Application.Repository;
+using EnvelopeGenerator.Application.Common.Dto;
+using EnvelopeGenerator.Domain.Entities;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace EnvelopeGenerator.Application.Envelopes.Queries;
+
+/// <summary>
+/// 
+/// </summary>
+public record ReadSignedEnvelopeQuery : IRequest<IEnumerable<EnvelopeDto>>
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public bool? Burned { get; init; } = null;
+
+    internal int? UserId { get; private set; } = null;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="userId"></param>
+    /// <returns></returns>
+    public ReadSignedEnvelopeQuery Authorized(int userId)
+    {
+        UserId = userId;
+        return this;
+    }
+}
+
+/// <summary>
+/// 
+/// </summary>
+/// <param name="Repo"></param>
+/// <param name="Mapper"></param>
+public class ReadSignedEnvelopeQueryHandler(IRepository<Envelope> Repo, IMapper Mapper) : IRequestHandler<ReadSignedEnvelopeQuery, IEnumerable<EnvelopeDto>>
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="request"></param>
+    /// <param name="cancel"></param>
+    /// <returns></returns>
+    /// <exception cref="NotImplementedException"></exception>
+    public async Task<IEnumerable<EnvelopeDto>> Handle(ReadSignedEnvelopeQuery request, CancellationToken cancel)
+    {
+        var eQuery = Repo.Query.Where(e => e.Status == Domain.Constants.EnvelopeStatus.EnvelopeCompletelySigned);
+
+        if (request.Burned is bool burned)
+            eQuery = burned ? eQuery.Where(e => e.DocResult != null) : eQuery.Where(e => e.DocResult == null);
+
+        if(request.UserId is int userId)
+            eQuery = eQuery.Where(e => e.UserId == userId);
+
+        var envelopes = await eQuery.ToListAsync(cancel);
+
+        return Mapper.Map<IEnumerable<EnvelopeDto>>(envelopes);
+    }
+}

EnvelopeGenerator.Application/PdfSigning/FinalizeEnvelopeCommand.cs

@@ -0,0 +1,109 @@
+using DigitalData.Core.Abstraction.Application.Repository;
+using DigitalData.Core.Exceptions;
+using EnvelopeGenerator.Application.Common.Interfaces.Services.Notification;
+using EnvelopeGenerator.Application.Common.Query;
+using EnvelopeGenerator.Domain.Constants;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Domain.Interfaces;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace EnvelopeGenerator.Application.PdfSigning;
+
+/// <summary>
+/// 
+/// </summary>
+public record FinalizeEnvelopeCommand : EnvelopeQueryBase, IRequest
+{
+    internal int? UserId { get; private set; } = null;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="userId"></param>
+    /// <returns></returns>
+    public FinalizeEnvelopeCommand Authorized(int userId)
+    {
+        UserId = userId;
+        return this;
+    }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public bool BurnedAllowed { get; init; } = false;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public bool SaveDocResult { get; init; } = true;
+}
+
+/// <summary>
+/// 
+/// </summary>
+/// <param name="Repo"></param>
+/// <param name="Sender"></param>
+/// <param name="NtfServer"></param>
+public class FinalizeEnvelopeCommandHandler(IRepository<Envelope> Repo, ISender Sender, IEnvelopeNotificationService NtfServer) : IRequestHandler<FinalizeEnvelopeCommand>
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="request"></param>
+    /// <param name="cancel"></param>
+    /// <returns></returns>
+    /// <exception cref="NotFoundException"></exception>
+    public async Task Handle(FinalizeEnvelopeCommand request, CancellationToken cancel)
+    {
+        var envelopeQuery = Repo.Query;
+
+        if (request.Id is int id)
+            envelopeQuery = envelopeQuery.Where(e => e.Id == id);
+        else if (request.Uuid is string uuid)
+            envelopeQuery = envelopeQuery.Where(e => e.Uuid == uuid);
+        
+        var envelope = await envelopeQuery
+            .Include(e => e.EnvelopeReceivers).ThenInclude(er => er.Receiver)
+            .Include(e => e.Documents)
+            .SingleOrDefaultAsync(cancel)
+                ?? throw new NotFoundException($"Envelope is not found ID: {request.Id} UUID: {request.Uuid}");
+
+        if(request.UserId is int userId && userId != envelope.UserId)
+            throw new InvalidOperationException($"Envelope is not owned by user ID: {request.Id} UUID: {request.Uuid}");
+
+        // already burned
+        if (!request.BurnedAllowed && envelope.IsBurned())
+            throw new InvalidOperationException($"Envelope is already burned ID: {request.Id} UUID: {request.Uuid}");
+
+        // envelope is not completely signed
+        if (envelope.Status!= EnvelopeStatus.EnvelopeCompletelySigned)
+            throw new InvalidOperationException($"Envelope status is not completely signed ID: {request.Id} UUID: {request.Uuid}");
+
+        using var docStream = await Sender.Send(new SignPdfByEnvelopeCommand()
+        {
+            Envelope = envelope
+        }, cancel);
+
+        if (docStream.CanSeek) 
+            docStream.Position = 0;
+
+        using var ms = new MemoryStream();
+        docStream.CopyTo(ms);
+        byte[] doc = ms.ToArray();
+
+        foreach (var er in envelope.EnvelopeReceivers)
+        {
+            await NtfServer.Notify(er.Receiver.EmailAddress, new DocumentSignedNotification()
+            {
+                DocumentTitle = envelope.Title,
+                NameReceiver = er.Name,
+                Attachments = [($"unterzeichnetes-dokument.pdf", doc)],
+                IsReadAndConfirm = envelope.IsReadAndConfirm(),
+            }, cancel);
+        }
+
+        if (request.SaveDocResult)
+            await Repo.UpdateAsync(e => e.DocResult = doc, e => e.Id == envelope.Id, cancel);
+    }
+}

EnvelopeGenerator.Application/PdfSigning/SignPdfByElementCommand.cs

@@ -0,0 +1,133 @@
+using DigitalData.Core.Exceptions;
+using EnvelopeGenerator.Application.Common.Configurations;
+using EnvelopeGenerator.Application.Common.Dto;
+using EnvelopeGenerator.Application.Common.Enums;
+using EnvelopeGenerator.Application.Common.Interfaces.Doc;
+using EnvelopeGenerator.Application.Common.Interfaces.Services;
+using EnvelopeGenerator.Application.DocReceiverElements.Queries;
+using MediatR;
+using Microsoft.Extensions.Options;
+
+namespace EnvelopeGenerator.Application.PdfSigning;
+
+/// <summary>
+/// 
+/// </summary>
+public record SignPdfByElementCommand : IRequest<Stream>
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public DocReceiverElementDto? Element { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public int? ElementId { get; init; }
+
+    /// <summary>
+    /// Custom document 
+    /// </summary>
+    public Stream? Document { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string? Phone { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string? Reason { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public PdfSignatureCertificationLevel CertificationLevel { get; init; } = PdfSignatureCertificationLevel.NoChangesAllowed;
+}
+
+/// <summary>
+/// 
+/// </summary>
+/// <param name="sender"></param>
+/// <param name="signService"></param>
+/// <param name="imgRenderer"></param>
+/// <param name="options"></param>
+public class SignPdfCommandHandler(ISender sender, IPdfDigitalSignatureService signService, IPdfPageImageRenderer imgRenderer, IOptionsMonitor<ESignParams> options) : IRequestHandler<SignPdfByElementCommand, Stream>
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="request"></param>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    public async Task<Stream> Handle(SignPdfByElementCommand request, CancellationToken cancellationToken)
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+
+        // ensure element
+        if (request.Element is null)
+        {
+            var elements = await sender.Send(new ReadDocReceiverElementQuery() 
+            {
+                Id = request.ElementId!,
+                IncludeDocument = request.Document is null
+            }, cancellationToken);
+            
+            request.Element = elements.FirstOrDefault() ?? throw new NotFoundException($"Element with ID {request.ElementId} not found."); ;
+        }
+
+        // ensure document
+        if(request.Document is null)
+        {
+            if (request.Element?.Document?.ByteData is not { Length: > 0 })
+                throw new NotFoundException("Document data is missing or empty.");
+
+            request.Document = new MemoryStream(request.Element.Document.ByteData);
+        }
+
+        ValidateAfterDataIsComplete(request);
+
+        // create signature image from element
+        var img = imgRenderer.ComposeSignaturePreviewPng(request.Element);
+
+        // sign pdf
+        var outputPdf = new MemoryStream();
+
+        await signService.SignPdfAsync(
+            inputPdf: request.Document,
+            outputPdf: outputPdf,
+            options: new PdfSignOptionsDto
+            {
+                Name = request.Element.FullName!,
+                Location = request.Element.Position!,
+                Phone = request.Phone,
+                Reason = request.Reason ?? options.CurrentValue.DefaultReason,
+                Email = request.Element.Receiver!.EmailAddress,
+                ApplicationName = options.CurrentValue.ApplicationName,
+                DocumentElementId = request.Element.Id,
+
+                CertificationLevel = request.CertificationLevel,
+                Appearance = new PdfSignatureAppearanceDto(
+                    PageNumber: request.Element.Page,
+                    Left: request.Element.Left,
+                    Bottom: request.Element.Y,
+                    Width: request.Element.Width,
+                    Height: request.Element.Height,
+                    CoordinateUnit: PdfSignatureCoordinateUnit.Inch,
+                    CoordinateOrigin: PdfSignatureCoordinateOrigin.TopLeft)
+            },
+            image: img,
+            cancellationToken: cancellationToken);
+
+        return outputPdf;
+    }
+
+    private static void ValidateAfterDataIsComplete(SignPdfByElementCommand request)
+    {
+        if(request.Element!.FullName is null)
+            throw new BadRequestException($"Document is not signed. FullName is required. Element ID: {request.Element.Id}");
+        else if(request.Element.Position is null)
+            throw new BadRequestException($"Document is not signed. Position is required. Element ID: {request.Element.Id}");
+    }
+}

EnvelopeGenerator.Application/PdfSigning/SignPdfByElementCommandValidator.cs

@@ -0,0 +1,18 @@
+using FluentValidation;
+
+namespace EnvelopeGenerator.Application.PdfSigning;
+
+public class SignPdfByElementCommandValidator : AbstractValidator<SignPdfByElementCommand>
+{
+    public SignPdfByElementCommandValidator()
+    {
+        RuleFor(x => x)
+            .Must(x => (x.Element is not null) ^ x.ElementId.HasValue)
+            .WithMessage("Exactly one of Element or ElementId must be provided.");
+
+        RuleFor(x => x.ElementId)
+            .GreaterThan(0)
+            .When(x => x.ElementId.HasValue)
+            .WithMessage("ElementId must be greater than 0.");
+    }
+}

EnvelopeGenerator.Application/PdfSigning/SignPdfByEnvelopeCommand.cs

@@ -0,0 +1,94 @@
+using DigitalData.Core.Abstraction.Application.Repository;
+using DigitalData.Core.Exceptions;
+using EnvelopeGenerator.Application.Common.Query;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Domain.Exceptions;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace EnvelopeGenerator.Application.PdfSigning;
+/// <summary>
+/// 
+/// </summary>
+public record SignPdfByEnvelopeCommand : EnvelopeQueryBase, IRequest<Stream>
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public int? ReceiverId { get; init; } = null;
+
+    internal int? UserId { get; private set; } = null;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="userId"></param>
+    /// <returns></returns>
+    public SignPdfByEnvelopeCommand Authorized(int userId)
+    {
+        UserId = userId;
+        return this;
+    }
+
+    internal Envelope? Envelope { get; set; }
+}
+
+/// <summary>
+/// 
+/// </summary>
+public class SignPdfByEnvelopeCommandHandler(IRepository<Envelope> Repo, ISender sender) : IRequestHandler<SignPdfByEnvelopeCommand, Stream>
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="request"></param>
+    /// <param name="cancel"></param>
+    /// <returns></returns>
+    /// <exception cref="NotImplementedException"></exception>
+    public async Task<Stream> Handle(SignPdfByEnvelopeCommand request, CancellationToken cancel)
+    {
+        if (request.Envelope is null)
+        {
+            var envelopeQuery = Repo.Query;
+
+            if (request.Id is int id)
+                envelopeQuery = envelopeQuery.Where(e => e.Id == id);
+            else if (request.Uuid is string uuid)
+                envelopeQuery = envelopeQuery.Where(e => e.Uuid == uuid);
+
+            request.Envelope = await envelopeQuery.Include(e => e.EnvelopeReceivers).Include(e => e.Documents).SingleOrDefaultAsync(cancel) 
+                ?? throw new NotFoundException($"Envelope is not found ID: {request.Id} UUID: {request.Uuid}");
+        }
+
+        var envelope = request.Envelope;
+
+        if (request.UserId is int userId && userId != envelope.UserId)
+            throw new AuthorizationException($"Envelope is not authorized for user with Id: {request.UserId} Envelope ID: {request.Id} UUID: {request.Uuid}");
+
+        if (envelope.EnvelopeReceivers.Count == 0)
+            throw new NotFoundException($"Envelope has no receivers to sign ID: {request.Id} UUID: {request.Uuid}");
+
+        if(envelope.Documents.FirstOrDefault() is not Document document || document.ByteData is not byte[] byteData || byteData.Length == 0)
+            throw new NotFoundException($"Envelope has no documents to sign ID: {request.Id} UUID: {request.Uuid}");
+
+        Stream doc = new MemoryStream(byteData);
+
+        var eReceivers = request.ReceiverId is int receiverId
+            ? envelope.EnvelopeReceivers.Where(e => e.ReceiverId == receiverId)
+            : envelope.EnvelopeReceivers;
+
+        foreach (var eReceiver in eReceivers)
+        {
+            var signedDoc = await sender.Send(new SignPdfByEnvelopeReceiverCommand()
+            {
+                EnvelopeId = eReceiver.EnvelopeId,
+                ReceiverId = eReceiver.ReceiverId
+            }, cancel);
+
+            await doc.DisposeAsync();
+            doc = signedDoc;
+        }
+
+        return doc;
+    }
+}

EnvelopeGenerator.Application/PdfSigning/SignPdfByEnvelopeReceiverCommand.cs

@@ -0,0 +1,99 @@
+using AutoMapper;
+using DigitalData.Core.Abstraction.Application.Repository;
+using DigitalData.Core.Exceptions;
+using EnvelopeGenerator.Application.Common.Dto;
+using EnvelopeGenerator.Application.Common.Enums;
+using EnvelopeGenerator.Application.Documents.Queries;
+using EnvelopeGenerator.Application.EnvelopeReceivers.Queries;
+using EnvelopeGenerator.Application.Envelopes.Queries;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Domain.Exceptions;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace EnvelopeGenerator.Application.PdfSigning;
+
+/// <summary>
+/// 
+/// </summary>
+public record SignPdfByEnvelopeReceiverCommand : IRequest<Stream>
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public int EnvelopeId { get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public int ReceiverId { get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public Stream? Document { get; set; }
+}
+
+/// <summary>
+/// 
+/// </summary>
+public class SignPdfByEnvelopeReceiverCommandHandler(IRepository<DocReceiverElement> Repo, IMapper Mapper, ISender Sender) : IRequestHandler<SignPdfByEnvelopeReceiverCommand, Stream>
+{
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="request"></param>
+    /// <param name="cancel"></param>
+    /// <returns></returns>
+    /// <exception cref="NotFoundException"></exception>
+    public async Task<Stream> Handle(SignPdfByEnvelopeReceiverCommand request, CancellationToken cancel)
+    {
+        cancel.ThrowIfCancellationRequested();
+
+        // read elements
+        var elements = await Repo.Where(el => el.ReceiverId == request.ReceiverId && el.Document.EnvelopeId == request.EnvelopeId)
+            .Include(e => e.Receiver)
+            .ToListAsync(cancel) ?? throw new NotFoundException($"No elements found for Envelope ID {request.EnvelopeId} and Receiver ID {request.ReceiverId}.");
+        var elementDtos = Mapper.Map<List<DocReceiverElementDto>>(elements)
+            .OrderBy(e => e.Page)
+            .ThenBy(e => e.Id)
+            .ToList();
+
+        // read secrets for phone number
+        var erSecrets = await Sender.Send(new ReadEnvelopeReceiverSecretQuery()
+        {
+            Envelope = new() { Id = request.EnvelopeId },
+            Receiver = new() { Id = request.ReceiverId }
+        }, cancel) ?? throw new DataIntegrityException($"No secrets found for Envelope ID {request.EnvelopeId} and Receiver ID {request.ReceiverId}.");
+
+        // read document
+        if(request.Document is null)
+        {
+            var unsignedDoc = await Sender.Send(new ReadDocumentQuery(EnvelopeId: request.EnvelopeId), cancel);
+            var unsignedDocBytes = unsignedDoc.ByteData ?? throw new NotFoundException($"Document not found for Envelope ID {request.EnvelopeId} and Receiver ID {request.ReceiverId}.");
+            request.Document = new MemoryStream(unsignedDocBytes);
+        }
+
+        Stream doc = request.Document;
+
+        // sign document for each element
+        foreach (var element in elementDtos)
+        {
+            var lastElement = element == elementDtos.Last();
+
+            var signedDoc = await Sender.Send(new SignPdfByElementCommand
+            {
+                Document = doc,
+                Element = element,
+                CertificationLevel = lastElement ? PdfSignatureCertificationLevel.NoChangesAllowed : PdfSignatureCertificationLevel.FillFormsAndAnnotate,
+                Phone = erSecrets.PhoneNumber
+            }, cancel);
+
+            await doc.DisposeAsync();
+            doc = signedDoc;
+        }
+
+        return doc;
+    }
+}

EnvelopeGenerator.Application/Resources/Resource.de-DE.resx

@@ -123,6 +123,9 @@
   <data name="Back" xml:space="preserve">
     <value>Zurück</value>
   </data>
+  <data name="Next" xml:space="preserve">
+    <value>Weiter</value>
+  </data>
   <data name="AuthenticatorSetup_Prefix" xml:space="preserve">
     <value>Klicken Sie auf den</value>
   </data>
@@ -564,6 +567,12 @@
   <data name="AddReceiver" xml:space="preserve">
     <value>Empfänger hinzufügen</value>
   </data>
+  <data name="SenderWizard_RecentReceivers" xml:space="preserve">
+    <value>Zuletzt verwendete Empfänger</value>
+  </data>
+  <data name="Skip" xml:space="preserve">
+    <value>Überspringen</value>
+  </data>
   <data name="DeleteReceiver" xml:space="preserve">
     <value>Empfänger löschen</value>
   </data>
@@ -735,7 +744,9 @@
   <data name="SenderEditor_LoadFileError" xml:space="preserve"><value>Fehler beim Laden der Datei: {0}</value></data>
   <data name="SenderEditor_Message_Placeholder" xml:space="preserve"><value>Bitte unterzeichnen Sie das beigefügte Dokument.</value></data>
   <data name="SenderEditor_NoDocumentLoaded" xml:space="preserve"><value>Kein Dokument geladen</value></data>
+  <data name="SenderEditor_NoPagesToDisplay" xml:space="preserve"><value>Keine Seiten zur Anzeige verfügbar.</value></data>
   <data name="SenderEditor_NoReceiversAdded" xml:space="preserve"><value>Noch keine Empfänger hinzugefügt.</value></data>
+  <data name="SenderEditor_PageLabel" xml:space="preserve"><value>Seite</value></data>
   <data name="SenderEditor_PlaceSignatureField" xml:space="preserve"><value>Signaturfeld platzieren</value></data>
   <data name="SenderEditor_RemoveAllSignatureFields" xml:space="preserve"><value>Alle Signaturfelder entfernen</value></data>
   <data name="SenderEditor_SelectPdf" xml:space="preserve"><value>Bitte wählen Sie eine PDF-Datei aus.</value></data>

EnvelopeGenerator.Application/Resources/Resource.en-US.resx

@@ -123,6 +123,9 @@
   <data name="Back" xml:space="preserve">
     <value>Back</value>
   </data>
+  <data name="Next" xml:space="preserve">
+    <value>Next</value>
+  </data>
   <data name="AuthenticatorSetup_Prefix" xml:space="preserve">
     <value>Click the</value>
   </data>
@@ -564,6 +567,12 @@
   <data name="AddReceiver" xml:space="preserve">
     <value>Add Receiver</value>
   </data>
+  <data name="SenderWizard_RecentReceivers" xml:space="preserve">
+    <value>Recently used recipients</value>
+  </data>
+  <data name="Skip" xml:space="preserve">
+    <value>Skip</value>
+  </data>
   <data name="DeleteReceiver" xml:space="preserve">
     <value>Delete Receiver</value>
   </data>
@@ -735,7 +744,9 @@
   <data name="SenderEditor_LoadFileError" xml:space="preserve"><value>Error loading file: {0}</value></data>
   <data name="SenderEditor_Message_Placeholder" xml:space="preserve"><value>Please sign the attached document.</value></data>
   <data name="SenderEditor_NoDocumentLoaded" xml:space="preserve"><value>No document loaded</value></data>
+  <data name="SenderEditor_NoPagesToDisplay" xml:space="preserve"><value>No pages to display.</value></data>
   <data name="SenderEditor_NoReceiversAdded" xml:space="preserve"><value>No receivers added yet.</value></data>
+  <data name="SenderEditor_PageLabel" xml:space="preserve"><value>Page</value></data>
   <data name="SenderEditor_PlaceSignatureField" xml:space="preserve"><value>Place signature field</value></data>
   <data name="SenderEditor_RemoveAllSignatureFields" xml:space="preserve"><value>Remove all signature fields</value></data>
   <data name="SenderEditor_SelectPdf" xml:space="preserve"><value>Please select a PDF file.</value></data>

EnvelopeGenerator.Application/Resources/Resource.fr-FR.resx

@@ -123,6 +123,9 @@
   <data name="Back" xml:space="preserve">
     <value>Retour</value>
   </data>
+  <data name="Next" xml:space="preserve">
+    <value>Suivant</value>
+  </data>
   <data name="AuthenticatorSetup_Prefix" xml:space="preserve">
     <value>Cliquez sur</value>
   </data>
@@ -564,6 +567,12 @@
   <data name="AddReceiver" xml:space="preserve">
     <value>Ajouter un destinataire</value>
   </data>
+  <data name="SenderWizard_RecentReceivers" xml:space="preserve">
+    <value>Destinataires recents</value>
+  </data>
+  <data name="Skip" xml:space="preserve">
+    <value>Passer</value>
+  </data>
   <data name="DeleteReceiver" xml:space="preserve">
     <value>Supprimer le destinataire</value>
   </data>
@@ -735,7 +744,9 @@
   <data name="SenderEditor_LoadFileError" xml:space="preserve"><value>Erreur lors du chargement du fichier : {0}</value></data>
   <data name="SenderEditor_Message_Placeholder" xml:space="preserve"><value>Veuillez signer le document ci-joint.</value></data>
   <data name="SenderEditor_NoDocumentLoaded" xml:space="preserve"><value>Aucun document chargé</value></data>
+  <data name="SenderEditor_NoPagesToDisplay" xml:space="preserve"><value>Aucune page à afficher.</value></data>
   <data name="SenderEditor_NoReceiversAdded" xml:space="preserve"><value>Aucun destinataire ajouté pour le moment.</value></data>
+  <data name="SenderEditor_PageLabel" xml:space="preserve"><value>Page</value></data>
   <data name="SenderEditor_PlaceSignatureField" xml:space="preserve"><value>Placer un champ de signature</value></data>
   <data name="SenderEditor_RemoveAllSignatureFields" xml:space="preserve"><value>Supprimer tous les champs de signature</value></data>
   <data name="SenderEditor_SelectPdf" xml:space="preserve"><value>Veuillez sélectionner un fichier PDF.</value></data>

EnvelopeGenerator.Domain/Constants/CertificationType.cs

@@ -2,8 +2,7 @@
 {
     public enum CertificationType
     {
-        AdvancedElectronicSignature = 1
-        // ElectronicSignature = 1
-        // QualifiedSignature = 2
+        AdvancedElectronicSignature = 1,
+        ElectronicSignature = 2
     }
 }

EnvelopeGenerator.Domain/Constants/EnvelopeStatus.cs

@@ -67,7 +67,7 @@ namespace EnvelopeGenerator.Domain.Constants
     {
         public static bool IsActive(this EnvelopeStatus status)
         {
-            return status >= EnvelopeStatus.EnvelopeCreated && status < EnvelopeStatus.EnvelopePartlySigned;
+            return status >= EnvelopeStatus.EnvelopeCreated && status <= EnvelopeStatus.EnvelopePartlySigned;
         }
 
         public static bool IsCompleted(this EnvelopeStatus status)

EnvelopeGenerator.Domain/Entities/DocReceiverElement.cs

@@ -11,7 +11,7 @@ using System.Collections.Generic;
 namespace EnvelopeGenerator.Domain.Entities
 {
     [Table("TBSIG_DOCUMENT_RECEIVER_ELEMENT", Schema = "dbo")]
-    public class DocReceiverElement : IDocReceiverElement, IHasReceiver, IHasAddedWhen, IUpdateAuditable
+    public class DocReceiverElement : IDocReceiverElement, ISignatureInkPayload, IHasReceiver, IHasAddedWhen, IUpdateAuditable
     {
         public DocReceiverElement()
         {

EnvelopeGenerator.Domain/Entities/Envelope.cs

@@ -30,7 +30,7 @@ namespace EnvelopeGenerator.Domain.Entities
             SendReminderEmails = false;
             FirstReminderDays = 0;
             ReminderIntervalDays = 0;
-            CertificationType = (int)Constants.CertificationType.AdvancedElectronicSignature;
+            CertificationType = Constants.CertificationType.AdvancedElectronicSignature;
             UseAccessCode = false;
             Documents = Enumerable.Empty<Document>().ToList();
             Histories = Enumerable.Empty<History>().ToList();
@@ -83,7 +83,7 @@ namespace EnvelopeGenerator.Domain.Entities
         public string Comment { get; set; }
 
         [Column("CONTRACT_TYPE")]
-        public int? ContractType { get; set; }
+        public ContractType? ContractType { get; set; }
 
 #if NETFRAMEWORK
         [NotMapped]
@@ -111,7 +111,7 @@ namespace EnvelopeGenerator.Domain.Entities
         public bool ReadOnly => this.IsReadAndConfirm();
 
         [Column("CERTIFICATION_TYPE")]
-        public int? CertificationType { get; set; }
+        public CertificationType? CertificationType { get; set; }
 
         [Column("USE_ACCESS_CODE")]
         public bool? UseAccessCode { get; set; }
@@ -129,7 +129,11 @@ namespace EnvelopeGenerator.Domain.Entities
         public int? ExpiresWarningWhenDays { get; set; }
 
         [ForeignKey("UserId")]
-        public User User { get; set; }
+        public User
+#if nullable
+            ?
+#endif
+            User { get; set; }
 
         [Column("TFA_ENABLED")]
         public bool? TfaEnabled { get; set; }
@@ -137,7 +141,6 @@ namespace EnvelopeGenerator.Domain.Entities
             = false;
 #endif
 
-        [NotMapped]
         [Column("DOC_RESULT")]
         public byte[]
 #if nullable

EnvelopeGenerator.Domain/Entities/EnvelopeType.cs

@@ -1,5 +1,7 @@
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
+using EnvelopeGenerator.Domain.Constants;
+
 #if NETFRAMEWORK
 using System;
 #endif
@@ -22,41 +24,41 @@ namespace EnvelopeGenerator.Domain.Entities
         public string Language { get; set; }
 
         [Column("EXPIRES_DAYS")]
-        public int ExpiresDays { get; set; }
+        public int? ExpiresDays { get; set; }
 
         [Column("CERTIFICATION_TYPE")]
-        public Constants.CertificationType CertificationType { get; set; } = Constants.CertificationType.AdvancedElectronicSignature;
+        public Constants.CertificationType? CertificationType { get; set; }
 
         [Column("USE_ACCESS_CODE")]
-        public bool UseAccessCode { get; set; }
+        public bool? UseAccessCode { get; set; }
 
         [Column("FINAL_EMAIL_TO_CREATOR")]
-        public Constants.FinalEmailType FinalEmailToCreator { get; set; }
+        public Constants.FinalEmailType? FinalEmailToCreator { get; set; }
 
         [Column("FINAL_EMAIL_TO_RECEIVERS")]
-        public Constants.FinalEmailType FinalEmailToReceivers { get; set; }
+        public Constants.FinalEmailType? FinalEmailToReceivers { get; set; }
 
         [Required]
         [Column("ADDED_WHEN", TypeName = "datetime")]
         public DateTime AddedWhen { get; set; }
 
         [Column("CHANGED_WHEN", TypeName = "datetime")]
-        public DateTime ChangedWhen { get; set; }
+        public DateTime? ChangedWhen { get; set; }
 
         [Column("EXPIRES_WARNING_DAYS")]
-        public int ExpiresWarningDays { get; set; }
+        public int? ExpiresWarningDays { get; set; }
 
         [Column("SEND_REMINDER_EMAILS")]
-        public bool SendReminderEmails { get; set; } = false;
+        public bool? SendReminderEmails { get; set; }
 
         [Column("FIRST_REMINDER_DAYS")]
-        public int FirstReminderDays { get; set; } = 0;
+        public int? FirstReminderDays { get; set; }
 
         [Column("REMINDER_INTERVAL_DAYS")]
-        public int ReminderIntervalDays { get; set; } = 0;
+        public int? ReminderIntervalDays { get; set; }
 
         [Column("CONTRACT_TYPE")]
-        public int ContractType { get; set; }
+        public ContractType? ContractType { get; set; }
 
         [NotMapped]
         public bool TFA_Enabled { get; set; } = false;
@@ -70,14 +72,14 @@ namespace EnvelopeGenerator.Domain.Entities
         [NotMapped]
         public int ExpiresWhenDays
         {
-            get => ExpiresDays;
+            get => ExpiresDays ?? 0;
             set => ExpiresDays = value;
         }
 
         [NotMapped]
         public int ExpiresWarningWhenDays
         {
-            get => ExpiresWarningDays;
+            get => ExpiresWarningDays ?? 0;
             set => ExpiresWarningDays = value;
         }
 

EnvelopeGenerator.Domain/EnvelopeGenerator.Domain.csproj

@@ -2,6 +2,7 @@
 
   <PropertyGroup>
     <TargetFrameworks>net462;net7.0;net8.0;net9.0</TargetFrameworks>
+	<LangVersion>latest</LangVersion>
     <AssemblyVersion>1.4.0</AssemblyVersion>
     <FileVersion>1.4.0</FileVersion>
   </PropertyGroup>

EnvelopeGenerator.Domain/Exceptions/AuthorizationException.cs

@@ -0,0 +1,17 @@
+#if NETFRAMEWORK
+using System;
+#endif
+
+namespace EnvelopeGenerator.Domain.Exceptions
+{
+    public class AuthorizationException : Exception
+    {
+        public AuthorizationException(string message) : base(message)
+        {
+        }
+
+        public AuthorizationException()
+        {
+        }
+    }
+}

EnvelopeGenerator.Domain/Exceptions/DataIntegrityException.cs

@@ -0,0 +1,17 @@
+#if NETFRAMEWORK
+using System;
+#endif
+
+namespace EnvelopeGenerator.Domain.Exceptions
+{
+    public class DataIntegrityException : Exception
+    {
+        public DataIntegrityException(string message) : base(message)
+        {
+        }
+
+        public DataIntegrityException() : base()
+        {
+        }
+    }
+}

EnvelopeGenerator.Domain/Interfaces/IEnvelope.cs

@@ -3,6 +3,12 @@
     public interface IEnvelope
     {
         int? EnvelopeTypeId { get; set; }
+
+        byte[]
+#if nullable
+            ?
+#endif
+            DocResult { get; }
     }
 
     public static class EnvelopeExtensions
@@ -16,5 +22,10 @@
         {
             return envelope.EnvelopeTypeId != 2;
         }
+
+        public static bool IsBurned(this IEnvelope envelope)
+        {
+            return envelope.DocResult != null;
+        }
     }
 }

EnvelopeGenerator.Domain/Interfaces/ISignatureInkPayload.cs

@@ -0,0 +1,28 @@
+#if NETFRAMEWORK
+using System;
+#endif
+
+namespace EnvelopeGenerator.Domain.Interfaces
+{
+    public interface ISignatureInkPayload
+    {
+#if nullable
+        byte[]? Ink { get; }
+
+        string? FullName { get; }
+
+        string? Position { get; }
+
+        string? Place { get; }
+#else
+        byte[] Ink { get; }
+
+        string FullName { get; }
+
+        string Position { get; }
+
+        string Place { get; }
+#endif
+        DateTime? ChangedWhen { get; }
+    }
+}

EnvelopeGenerator.Domain/Resources/Model.en.resx

@@ -276,4 +276,61 @@
   <data name="YesWithAttachment" xml:space="preserve">
     <value>Yes, with Attachment</value>
   </data>
+  <data name="ElectronicSignature" xml:space="preserve">
+    <value>Electronic Signature</value>
+  </data>
+  <data name="EnvelopeType" xml:space="preserve">
+    <value>Envelope Type</value>
+  </data>
+  <data name="Language" xml:space="preserve">
+    <value>Language</value>
+  </data>
+  <data name="CertificationType" xml:space="preserve">
+    <value>Certification</value>
+  </data>
+  <data name="TFAEnabled" xml:space="preserve">
+    <value>2FA enabled</value>
+  </data>
+  <data name="UseAccessCode" xml:space="preserve">
+    <value>Use Access Code</value>
+  </data>
+  <data name="FinalEmailToCreator" xml:space="preserve">
+    <value>Final Email to Creator</value>
+  </data>
+  <data name="FinalEmailToReceivers" xml:space="preserve">
+    <value>Final Email to Receivers</value>
+  </data>
+  <data name="SendReminderEmails" xml:space="preserve">
+    <value>Send Reminder Emails</value>
+  </data>
+  <data name="FirstReminderDays" xml:space="preserve">
+    <value>First Reminder (Days)</value>
+  </data>
+  <data name="ReminderIntervalDays" xml:space="preserve">
+    <value>Reminder Interval (Days)</value>
+  </data>
+  <data name="ExpiresWhenDays" xml:space="preserve">
+    <value>Expires After (Days)</value>
+  </data>
+  <data name="ExpiresWarningWhenDays" xml:space="preserve">
+    <value>Expiry Warning (Days)</value>
+  </data>
+  <data name="SenderEditor_EnvelopeSettings" xml:space="preserve">
+    <value>Envelope Settings</value>
+  </data>
+  <data name="SenderEditor_AdvancedOptional" xml:space="preserve">
+    <value>Advanced</value>
+  </data>
+  <data name="SenderEditor_SelectTemplate" xml:space="preserve">
+    <value>Select Template</value>
+  </data>
+  <data name="SenderEditor_Validation_ReminderInterval" xml:space="preserve">
+    <value>Please enter a reminder interval greater than 0 days.</value>
+  </data>
+  <data name="SenderEditor_Validation_FirstReminder" xml:space="preserve">
+    <value>Please enter valid days for the first reminder.</value>
+  </data>
+  <data name="SenderEditor_Validation_ExpiryWarning" xml:space="preserve">
+    <value>The expiry warning cannot be after the expiry date.</value>
+  </data>
 </root>

EnvelopeGenerator.Domain/Resources/Model.fr-FR.resx

@@ -113,4 +113,61 @@
   <data name="MessageInvitationSent" xml:space="preserve">
     <value>Invitation envoyee</value>
   </data>
+  <data name="ElectronicSignature" xml:space="preserve">
+    <value>Signature electronique</value>
+  </data>
+  <data name="EnvelopeType" xml:space="preserve">
+    <value>Type d'enveloppe</value>
+  </data>
+  <data name="Language" xml:space="preserve">
+    <value>Langue</value>
+  </data>
+  <data name="CertificationType" xml:space="preserve">
+    <value>Certification</value>
+  </data>
+  <data name="TFAEnabled" xml:space="preserve">
+    <value>2FA active</value>
+  </data>
+  <data name="UseAccessCode" xml:space="preserve">
+    <value>Utiliser un code d'acces</value>
+  </data>
+  <data name="FinalEmailToCreator" xml:space="preserve">
+    <value>E-mail final au createur</value>
+  </data>
+  <data name="FinalEmailToReceivers" xml:space="preserve">
+    <value>E-mail final aux destinataires</value>
+  </data>
+  <data name="SendReminderEmails" xml:space="preserve">
+    <value>Envoyer des e-mails de rappel</value>
+  </data>
+  <data name="FirstReminderDays" xml:space="preserve">
+    <value>Premier rappel (jours)</value>
+  </data>
+  <data name="ReminderIntervalDays" xml:space="preserve">
+    <value>Intervalle de rappel (jours)</value>
+  </data>
+  <data name="ExpiresWhenDays" xml:space="preserve">
+    <value>Expire apres (jours)</value>
+  </data>
+  <data name="ExpiresWarningWhenDays" xml:space="preserve">
+    <value>Avertissement d'expiration (jours)</value>
+  </data>
+  <data name="SenderEditor_EnvelopeSettings" xml:space="preserve">
+    <value>Parametres de l'enveloppe</value>
+  </data>
+  <data name="SenderEditor_AdvancedOptional" xml:space="preserve">
+    <value>Avance</value>
+  </data>
+  <data name="SenderEditor_SelectTemplate" xml:space="preserve">
+    <value>Selectionner un modele</value>
+  </data>
+  <data name="SenderEditor_Validation_ReminderInterval" xml:space="preserve">
+    <value>Veuillez saisir un intervalle de rappel superieur a 0 jour.</value>
+  </data>
+  <data name="SenderEditor_Validation_FirstReminder" xml:space="preserve">
+    <value>Veuillez saisir des jours valides pour le premier rappel.</value>
+  </data>
+  <data name="SenderEditor_Validation_ExpiryWarning" xml:space="preserve">
+    <value>L'avertissement d'expiration ne peut pas etre apres la date d'expiration.</value>
+  </data>
 </root>

EnvelopeGenerator.Domain/Resources/Model.resx

@@ -279,4 +279,61 @@
   <data name="YesWithAttachment" xml:space="preserve">
     <value>Ja, mit Anhang</value>
   </data>
+  <data name="ElectronicSignature" xml:space="preserve">
+    <value>Elektronische Signatur</value>
+  </data>
+  <data name="EnvelopeType" xml:space="preserve">
+    <value>Umschlagtyp</value>
+  </data>
+  <data name="Language" xml:space="preserve">
+    <value>Sprache</value>
+  </data>
+  <data name="CertificationType" xml:space="preserve">
+    <value>Zertifizierung</value>
+  </data>
+  <data name="TFAEnabled" xml:space="preserve">
+    <value>2FA aktiviert</value>
+  </data>
+  <data name="UseAccessCode" xml:space="preserve">
+    <value>Zugriffscode verwenden</value>
+  </data>
+  <data name="FinalEmailToCreator" xml:space="preserve">
+    <value>Finale E-Mail an Ersteller</value>
+  </data>
+  <data name="FinalEmailToReceivers" xml:space="preserve">
+    <value>Finale E-Mail an Empfänger</value>
+  </data>
+  <data name="SendReminderEmails" xml:space="preserve">
+    <value>Erinnerungs-E-Mails senden</value>
+  </data>
+  <data name="FirstReminderDays" xml:space="preserve">
+    <value>Erste Erinnerung (Tage)</value>
+  </data>
+  <data name="ReminderIntervalDays" xml:space="preserve">
+    <value>Erinnerungsintervall (Tage)</value>
+  </data>
+  <data name="ExpiresWhenDays" xml:space="preserve">
+    <value>Läuft ab nach (Tage)</value>
+  </data>
+  <data name="ExpiresWarningWhenDays" xml:space="preserve">
+    <value>Ablaufwarnung (Tage)</value>
+  </data>
+  <data name="SenderEditor_EnvelopeSettings" xml:space="preserve">
+    <value>Envelope-Einstellungen</value>
+  </data>
+  <data name="SenderEditor_AdvancedOptional" xml:space="preserve">
+    <value>Erweitert</value>
+  </data>
+  <data name="SenderEditor_SelectTemplate" xml:space="preserve">
+    <value>Vorlage auswählen</value>
+  </data>
+  <data name="SenderEditor_Validation_ReminderInterval" xml:space="preserve">
+    <value>Bitte geben Sie ein Erinnerungsintervall größer als 0 Tage ein.</value>
+  </data>
+  <data name="SenderEditor_Validation_FirstReminder" xml:space="preserve">
+    <value>Bitte geben Sie gültige Tage für die erste Erinnerung ein.</value>
+  </data>
+  <data name="SenderEditor_Validation_ExpiryWarning" xml:space="preserve">
+    <value>Die Ablaufwarnung darf nicht nach dem Ablaufdatum liegen.</value>
+  </data>
 </root>

EnvelopeGenerator.Form/frmEnvelopeMainData.vb

@@ -105,10 +105,10 @@ Public Class frmEnvelopeMainData
         End If
     End Sub
     Private Function TranslateCertificationType(pType As CertificationType) As String
-        Return Resources.Model.ResourceManager.GetString(pType.ToString())
+        Return CommonServices.My.Resources.Model.ResourceManager.GetString(pType.ToString())
     End Function
     Private Function TranslateFinalEmailType(pType As FinalEmailType) As String
-        Return Resources.Model.ResourceManager.GetString(pType.ToString())
+        Return CommonServices.My.Resources.Model.ResourceManager.GetString(pType.ToString())
     End Function
 
     Private Sub btOK_Click(sender As Object, e As EventArgs) Handles btOK.Click

EnvelopeGenerator.Infrastructure.Crypt/DependencyInjection/ServiceCollectionExtensions.cs

@@ -0,0 +1,23 @@
+using DocumentService.Client.Configuration;
+using DocumentService.Client.Extensions;
+using EnvelopeGenerator.Application.Common.Interfaces.Services;
+using EnvelopeGenerator.Infrastructure.Crypt.Services;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace EnvelopeGenerator.Infrastructure.Crypt.DependencyInjection;
+
+public static class ServiceCollectionExtensions
+{
+    public static IServiceCollection AddCryptInfrastructure(this IServiceCollection services, IConfiguration configuration)
+    {
+        var baseUrl = configuration["DocumentService:BaseUrl"]
+            ?? throw new InvalidOperationException("DocumentService:BaseUrl is not configured.");
+
+        services.AddDocumentServiceClients(options => options.BaseUrl = baseUrl);
+
+        services.AddSingleton<IPdfDigitalSignatureService, PdfDigitalSignatureService>();
+
+        return services;
+    }
+}

EnvelopeGenerator.Infrastructure.Crypt/EnvelopeGenerator.Infrastructure.Crypt.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="DocumentService.Client" Version="1.3.2" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="10.0.10" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\EnvelopeGenerator.Application\EnvelopeGenerator.Application.csproj" />
+  </ItemGroup>
+
+</Project>

EnvelopeGenerator.Infrastructure.Crypt/README.md

@@ -0,0 +1,384 @@
+# EnvelopeGenerator.Infrastructure.Crypt
+
+Umfassende technische Dokumentation der PKCS#11/SoftHSM-Integration fuer `EnvelopeGenerator`.
+
+Dieses Dokument konsolidiert und ersetzt die verteilten Runbooks aus:
+
+- `pkcs11-proxy-production/README.md`
+- `pkcs11-proxy-production/SSH_TEMP_ACCESS_MUST_DO.md`
+- aeltere Abschnitte in diesem README
+
+Zielgruppe: Senior Developer, Platform Engineers, DevOps, Security Owner.
+
+---
+
+## 1. Architekturueberblick
+
+### 1.1 Ziel
+
+`EnvelopeGenerator.Infrastructure.Crypt` stellt die kryptographische Infrastruktur fuer PDF-Signaturen bereit:
+
+- Signaturerzeugung mit Schluesseln in SoftHSM/PKCS#11
+- Zertifikat-Auslese aus Token
+- Signaturpruefung auf PDF-Ebene
+- Health/Startup-Selbsttest fuer Betriebsfaehigkeit
+
+### 1.2 Topologie (aktueller Betriebsmodus)
+
+Der aktuell implementierte Produktions-nahe Pfad ist:
+
+1. Linux hostet SoftHSM + `pkcs11-daemon` (Proxy-Server).
+2. Windows hostet `EnvelopeGenerator.Server`.
+3. Windows laedt ein Windows-kompatibles Proxy-PKCS#11-Modul (`libpkcs11-proxy.dll`).
+4. PKCS#11-Operationen werden ueber Socket (`PKCS11_PROXY_SOCKET`) an Linux weitergeleitet.
+
+Wichtig:
+
+- Ein Windows-Prozess kann **kein Linux `.so`** direkt laden.
+- Private Keys verbleiben im Token (nicht exportierbar).
+
+### 1.3 Laufzeitpfade in der Anwendung
+
+`Pkcs11InteropBootstrap` loest Assets relativ zu `Crypt:Pkcs11:AssetsRootPath` auf:
+
+- Modul: `pkcs11\windows\proxy\libpkcs11-proxy.dll`
+- Tool-Fallback: `pkcs11\windows\opensc\tools\pkcs11-tool.exe`
+
+Wenn `AssetsRootPath` leer ist, wird `AppContext.BaseDirectory` verwendet.
+
+---
+
+## 2. Linux-Seite: SoftHSM + Proxy Setup
+
+### 2.1 Basispakete
+
+Beispiel (Debian/Ubuntu):
+
+```bash
+sudo apt-get update && sudo apt-get install -y softhsm2 opensc p11-kit libengine-pkcs11-openssl
+```
+
+### 2.2 SoftHSM-Modulpfad pruefen
+
+```bash
+ldconfig -p | grep softhsm
+find /usr -name "libsofthsm2.so" 2>/dev/null
+```
+
+### 2.3 Token initialisieren
+
+```bash
+softhsm2-util --show-slots
+softhsm2-util --init-token --slot <uninitialized-slot> --label CompanyProdToken --so-pin <so-pin> --pin <user-pin>
+softhsm2-util --show-slots
+```
+
+Hinweis: Nach `--init-token` wird der Slot i. d. R. neu zugewiesen.
+
+### 2.4 Schluesselpaar erzeugen
+
+```bash
+pkcs11-tool --module /usr/lib/softhsm/libsofthsm2.so \
+  --slot <slot-id> --login --pin <user-pin> \
+  --keypairgen --key-type rsa:3072 --label company-sign-key-v1 --id 01
+```
+
+### 2.5 Zertifikat importieren
+
+```bash
+pkcs11-tool --module /usr/lib/softhsm/libsofthsm2.so \
+  --slot <slot-id> --login --pin <user-pin> \
+  --write-object ./company-sign-cert-v1.der --type cert --id 01 --label company-sign-cert-v1
+```
+
+### 2.6 Objektzustand verifizieren
+
+```bash
+pkcs11-tool --module /usr/lib/softhsm/libsofthsm2.so --slot <slot-id> --login --pin <user-pin> --list-objects
+pkcs11-tool --module /usr/lib/softhsm/libsofthsm2.so --slot <slot-id> --login --pin <user-pin> --list-objects --type cert
+```
+
+### 2.7 Proxy-Daemon endpoint stabilisieren
+
+Ein wiederkehrendes Betriebsproblem war ein zufaelliger/local-only Listener. Fix:
+
+```bash
+sudo mkdir -p /etc/systemd/system/pkcs11-proxy.service.d
+printf "[Service]\nEnvironment=PKCS11_DAEMON_SOCKET=tcp://0.0.0.0:5657\n" | sudo tee /etc/systemd/system/pkcs11-proxy.service.d/override.conf
+sudo systemctl daemon-reload
+sudo systemctl restart pkcs11-proxy.service
+```
+
+Pruefung:
+
+```bash
+systemctl show pkcs11-proxy.service -p Environment --no-pager
+ss -ltnp | grep 5657
+```
+
+---
+
+## 3. Web-API/Server-Seite: Installation und Asset-Bereitstellung
+
+### 3.1 Bezugsquellen der Windows-Artefakte
+
+Fuer den Proxy-Betrieb werden auf Windows benoetigt:
+
+1. Proxy-PKCS#11-DLL (`libpkcs11-proxy.dll`)
+2. Abhaengige Runtime-DLLs (z. B. MinGW runtime, je nach Build)
+3. `pkcs11-tool.exe` + zugehoerige OpenSC-DLLs fuer Fallback
+
+Beschaffung:
+
+- Build aus derselben `pkcs11-proxy`-Codebasis/Commit wie Linux-Daemon (Kompatibilitaet sicherstellen)
+- oder kontrolliert bereitgestellte, intern freigegebene Binaries
+
+### 3.2 Empfohlene Ablage im Repo
+
+Bundled Assets liegen unter:
+
+- `EnvelopeGenerator.Infrastructure.Crypt/resources/pkcs11/windows/proxy/`
+- `EnvelopeGenerator.Infrastructure.Crypt/resources/pkcs11/windows/opensc/tools/`
+- `EnvelopeGenerator.Infrastructure.Crypt/resources/pkcs11/windows/opensc/pkcs11/`
+
+Diese werden beim Build in den Output kopiert (siehe `.csproj`-Copy-Regeln).
+
+### 3.3 Deployment-Muster
+
+Es gibt zwei gueltige Wege:
+
+1. **Bundled (Dev/QA, schnelle Reproduzierbarkeit)**
+   - Assets werden mit dem Build ausgeliefert.
+   - `AssetsRootPath = null` -> Aufloesung via `AppContext.BaseDirectory`.
+
+2. **Zentraler Asset-Root (Prod, betriebliche Kontrolle)**
+   - Assets in zentralem Pfad (z. B. `E:\DataFiles\Digital Data\EnvelopeGenerator`).
+   - `AssetsRootPath` in `appsettings.json` auf diesen Root setzen.
+
+### 3.4 Anwendungskonfiguration (`Crypt:Pkcs11`)
+
+Beispiel:
+
+```json
+{
+  "Crypt": {
+    "Pkcs11": {
+      "AssetsRootPath": "E:\\DataFiles\\Digital Data\\EnvelopeGenerator",
+      "SlotId": 2021549410,
+      "TokenLabel": "CompanyProdToken",
+      "ProxySocket": "tcp://172.24.12.64:5657",
+      "UserPin": "<secret>",
+      "PrivateKeyLabel": "company-sign-key-v1",
+      "CertificateLabel": "company-sign-cert-v1",
+      "ApplicationName": "signFLOW",
+      "DefaultReason": null,
+      "UseUtcSigningTime": true,
+      "DefaultCertificationLevel": "NoCertification"
+    }
+  }
+}
+```
+
+Sicherheitsregel:
+
+- `UserPin` niemals in versionierte Dateien einchecken.
+- Secrets nur in Secret Store / nicht versionierte `appsettings.Secrets.json` / Vault.
+
+---
+
+## 4. Implementierte Services, Modelle, DTOs
+
+### 4.1 DI und Startverhalten
+
+- `AddCryptInfrastructure(...)` in `DependencyInjection/ServiceCollectionExtensions.cs`
+  - bindet `Pkcs11Options`
+  - registriert `IPdfDigitalSignatureService`
+  - registriert Startup-Self-Test Hosted Service
+
+### 4.2 Konfigurationsmodell
+
+- `Pkcs11Options` (`EnvelopeGenerator.Application/Common/Configurations/Pkcs11Options.cs`)
+  - `AssetsRootPath`, `SlotId`, `TokenLabel`, `ProxySocket`
+  - `UserPin`, `PrivateKeyLabel`, `CertificateLabel`
+  - `ApplicationName`, `DefaultReason`, `UseUtcSigningTime`, `DefaultCertificationLevel`
+  - `ResolvedLibraryPath`, `ResolvedToolPath` (Runtime-resolved)
+
+### 4.3 Kernservices
+
+1. `PdfDigitalSignatureService`
+   - Signiert PDF via DevExpress `PdfDeferredSignatureBuilder`
+   - Nutzt `Pkcs11ExternalSigner` fuer externe Signatur
+   - Erzwingt `ApplicationName` aus Config (nicht client-overridable)
+   - Erweitert `Reason` um strukturiertes Metaformat:
+     - `SFMETA:v1;doc=<uuid>;sha256=<hash>`
+   - Parse beim Verify und Mapping in DTO
+
+2. `Pkcs11InteropBootstrap`
+   - Loest Modul-/Toolpfade auf
+   - Setzt `PKCS11_PROXY_SOCKET`/`PKCS11_DAEMON_SOCKET`
+   - PATH-Ergaenzung fuer native Abhaengigkeiten
+   - Warmup via `pkcs11-tool -L`
+
+3. `Pkcs11SessionRunner`
+   - Interop Library-Load mit mehreren Init-Modi (Fallback-Reihenfolge)
+   - Slot-Resolution (`SlotId`/`TokenLabel`)
+   - Session Login/Logout
+
+4. `Pkcs11ToolBridge`
+   - Fallback via Prozessaufruf von `pkcs11-tool`
+   - Cert read und DigestInfo-Signatur
+
+5. `Pkcs11StartupSelfTestHostedService`
+   - Fuehrt beim Start Interop-Probe aus
+   - Fallback-Probe bei Interop-Fehler
+   - Schreibt strukturierten Status
+
+### 4.4 Wichtige Interfaces/DTOs
+
+- `IPdfDigitalSignatureService`
+  - `SignPdfAsync(...)`, `CheckPdfSignatureAsync(...)`, `ExtractOriginalPdfAsync(...)`
+- `IPkcs11SelfTestStatusProvider`
+- `PdfSignOptionsDto`
+  - `UUID`, `Reason`, `Name`, `Location`, `Email`, `Phone`, `CertificationLevel`
+- `PdfSignatureCheckResultDto` / `PdfSignatureCheckItemDto`
+  - inklusive `BusinessReason`, `UUID`, `OriginalDocumentSha256`
+- `Pkcs11SelfTestStatusDto`
+
+---
+
+## 5. Betriebserfahrungen und Challenges
+
+### 5.1 Interop vs Tool-Verhalten
+
+Beobachtetes Muster in der realen Umgebung:
+
+- `pkcs11-tool` konnte erfolgreich auf Token zugreifen und signieren.
+- `Pkcs11Interop` scheiterte mit `CKR_FUNCTION_NOT_SUPPORTED` bzw. fehlendem `C_Initialize` Pointer in bestimmten Modi.
+
+Konsequenz:
+
+- Architektur wurde auf **interop-first + controlled tool-fallback** erweitert.
+- Health-Endpunkt differenziert Modus (`interop`, `pkcs11-tool`, `failed`).
+
+### 5.2 Typische Fehlbilder
+
+- `CKR_DEVICE_ERROR` bei Socket-/Proxy-Problemen
+- `CRYPT_PROVIDER_UNAVAILABLE` bei Pfad/ABI/Dependency-Mismatch
+- `CRYPT_SLOT_NOT_FOUND` bei Slot-/Label-Mismatch
+- `CKR_PIN_INCORRECT` bei PIN-Fehler
+- 307 Redirects bei HTTP/HTTPS-Mix in manuellen Tests
+
+### 5.3 Plattformfallen
+
+- MSVC vs MinGW Build-Unterschiede fuer Proxy-Client
+- fehlende Laufzeit-DLLs (`PATH`/Side-by-side)
+- Architektur-Mismatch x86 vs x64
+- Daemon-Bindings nicht stabil (random localhost port statt fixed endpoint)
+
+---
+
+## 6. Health, Monitoring und Verifikation
+
+### 6.1 API Health
+
+- Endpoint: `GET /api/health/crypt`
+- Liefert:
+  - `success`, `mode`, `summary`, `interopError`, `toolError`, `checkedAtUtc`
+
+Empfehlung:
+
+- In Monitoring aufnehmen und bei `mode=pkcs11-tool` ueber laengere Zeit Warnung triggern.
+
+### 6.2 Smoke-Test (empfohlen vor Release)
+
+1. `GET /api/health/crypt` -> `success=true`
+2. `POST /api/PdfSignature/sign` mit Test-PDF
+3. `POST /api/PdfSignature/is-signed`
+4. Pruefen:
+   - `signed=true`
+   - `allSignaturesCryptographicallyValid=true`
+   - `UUID`/`OriginalDocumentSha256` korrekt gemappt
+
+---
+
+## 7. Sicherheits- und Betriebsrichtlinien
+
+### 7.1 Geheimnisse
+
+- PIN, SO-PIN, Root-Creds niemals in Doku/Screenshots/Repo.
+- Nach Troubleshooting: Credentials rotieren.
+
+### 7.2 Temporare SSH-Freigaben zwingend rueckbauen
+
+Wenn SSH temporaer geoeffnet wurde, MUSS danach Rollback erfolgen:
+
+```bash
+sudo systemctl disable --now ssh && sudo ufw delete allow from 172.24.10.11 to any port 22 proto tcp && sudo ufw status verbose && sudo systemctl status ssh --no-pager
+```
+
+Optional harte Bereinigung:
+
+```bash
+sudo apt-get purge -y openssh-server && sudo apt-get autoremove -y
+```
+
+### 7.3 Schluesselrotation
+
+- Neue Labels (`...-v2`) anlegen
+- App umkonfigurieren
+- Sign/Verify Regression testen
+- Altmaterial erst nach Freigabe entfernen
+
+---
+
+## 8. API-Verhalten bei Signaturmetadaten
+
+Aktueller Standard:
+
+- `UUID` kommt aus Sign-Input (nullable string). Wenn ungeltig/leer -> neue Guid wird erzeugt.
+- `Reason` wird intern angereichert mit strukturiertem Meta (`SFMETA:v1`).
+- `ApplicationName` ist rein serverseitig aus `appsettings` gesetzt.
+- `SigningTime` ist rein serverseitig und wird automatisch gesetzt (`UseUtcSigningTime=true` => `UtcNow`, sonst lokale Zeit).
+- `CertificationLevel` wird im Controller serverseitig gesetzt (`FormFillingAndAnnotations`), nicht vom Client.
+
+Damit ist das Verhalten deterministisch und manipulationsaermer fuer Integrationsclients.
+
+---
+
+## 9. Troubleshooting-Checkliste (praxisnah)
+
+1. Erreichbarkeit Linux Proxy:
+   - `Test-NetConnection <linux-host> -Port 5657`
+2. Token sichtbar?
+   - `pkcs11-tool --module <dll> -L -v`
+3. Zertifikat lesbar?
+   - `--read-object --type cert --label <cert-label>`
+4. Signatur technisch moeglich?
+   - `--sign -m SHA256-RSA-PKCS ...`
+5. App-Health check:
+   - `/api/health/crypt`
+6. App-sign/verify end-to-end:
+   - `/api/PdfSignature/sign` + `/api/PdfSignature/is-signed`
+
+Wenn Interop scheitert, aber Tool funktioniert:
+
+- Betrieb bleibt verfuegbar (Fallback),
+- aber Incident/Bug fuer Interop-Kompatibilitaet erfassen.
+
+---
+
+## 10. Ausblick / empfohlene Verbesserungen
+
+1. Binary Transport statt Base64 bei grossen PDFs in Render/Sign-Pipelines.
+2. Persistente Metriken fuer Fallback-Quote (`interop` vs `tool`).
+3. Zertifikatskette/OCSP/CRL Validierung als optionales Policy-Modul.
+4. CI-Pruefung auf unsichere SQL-Muster (parallel zum Security-Workstream).
+5. Standardisierte Toast/UX-Rueckmeldungen fuer Signierfehler in UI.
+
+---
+
+## 11. Referenzen
+
+- SoftHSMv2: `https://github.com/softhsm/SoftHSMv2`
+- OpenSC / pkcs11-tool: `https://github.com/OpenSC/OpenSC/wiki/Using-pkcs11-tool-and-OpenSSL`
+- PKCS#11 Standard: `https://www.oasis-open.org/committees/pkcs11/`

EnvelopeGenerator.Infrastructure.Crypt/Services/PdfDigitalSignatureService.cs

@@ -0,0 +1,77 @@
+using DocumentService.Client.Interfaces;
+using DocumentService.Client.Models.Requests;
+using EnvelopeGenerator.Application.Common.Dto;
+using EnvelopeGenerator.Application.Common.Interfaces.Services;
+using ClientCertLevel = DocumentService.Client.Models.Requests.PdfSignatureCertificationLevel;
+using ClientCoordUnit = DocumentService.Client.Models.Requests.PdfSignatureCoordinateUnit;
+using ClientCoordOrigin = DocumentService.Client.Models.Requests.PdfSignatureCoordinateOrigin;
+
+namespace EnvelopeGenerator.Infrastructure.Crypt.Services;
+
+/// <summary>
+/// Proxy that forwards PDF signing to the remote DocumentService API via <see cref="IPdfSignatureClient"/>.
+/// </summary>
+public sealed class PdfDigitalSignatureService(IPdfSignatureClient signatureClient) : IPdfDigitalSignatureService
+{
+    public async Task SignPdfAsync(Stream inputPdf, Stream outputPdf, PdfSignOptionsDto? options = null, Stream? image = null, CancellationToken cancellationToken = default)
+    {
+        var pdfBytes = await ReadAllBytesAsync(inputPdf, cancellationToken);
+        var imageBytes = image is null ? null : await ReadAllBytesAsync(image, cancellationToken);
+
+        using var signed = await signatureClient.SignAsync(pdfBytes, Map(options), imageBytes, cancellationToken);
+        await signed.CopyToAsync(outputPdf, cancellationToken);
+    }
+
+    public Task<PdfSignatureCheckResultDto> CheckPdfSignatureAsync(Stream inputPdf, CancellationToken cancellationToken = default)
+        => throw new NotSupportedException("Signature checking is handled by DocumentService and is not available through this proxy.");
+
+    private static SignPdfOptions Map(PdfSignOptionsDto? o) => new()
+    {
+        DocumentElementId = o?.DocumentElementId ?? 0,
+        Name = o?.Name ?? string.Empty,
+        Reason = o?.Reason,
+        Location = o?.Location,
+        Email = o?.Email,
+        Phone = o?.Phone,
+        ApplicationName = o?.ApplicationName,
+        CertificationLevel = (ClientCertLevel)(o?.CertificationLevel ?? EnvelopeGenerator.Application.Common.Enums.PdfSignatureCertificationLevel.NoCertification),
+        Appearance = o?.Appearance is null ? null : MapAppearance(o.Appearance)
+    };
+
+    private static PdfSignatureAppearance MapAppearance(PdfSignatureAppearanceDto a) => new()
+    {
+        PageNumber = a.PageNumber,
+        Left = a.Left,
+        Bottom = a.Bottom,
+        Width = a.Width,
+        Height = a.Height,
+        ShowLabels = a.ShowLabels,
+        ShowName = a.ShowName,
+        ShowDate = a.ShowDate,
+        ShowReason = a.ShowReason,
+        ShowLocation = a.ShowLocation,
+        ShowDistinguishedName = a.ShowDistinguishedName,
+        DateTimeFormat = a.DateTimeFormat,
+        CoordinateUnit = (ClientCoordUnit)a.CoordinateUnit,
+        CoordinateOrigin = (ClientCoordOrigin)a.CoordinateOrigin,
+        Font = new PdfSignatureFont
+        {
+            FamilyName = a.Font.FamilyName,
+            Size = a.Font.Size,
+            IsBold = a.Font.IsBold,
+            IsItalic = a.Font.IsItalic,
+            IsUnderline = a.Font.IsUnderline,
+            Color = new PdfSignatureColor { R = a.Font.Color.R, G = a.Font.Color.G, B = a.Font.Color.B }
+        }
+    };
+
+    private static async Task<byte[]> ReadAllBytesAsync(Stream stream, CancellationToken cancellationToken)
+    {
+        if (stream is MemoryStream memory && memory.TryGetBuffer(out var buffer))
+            return buffer.AsSpan(0, (int)memory.Length).ToArray();
+
+        using var copy = new MemoryStream();
+        await stream.CopyToAsync(copy, cancellationToken);
+        return copy.ToArray();
+    }
+}

EnvelopeGenerator.Infrastructure.Doc/DependencyInjection.cs

@@ -0,0 +1,18 @@
+using EnvelopeGenerator.Application.Common.Interfaces.Doc;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EnvelopeGenerator.Infrastructure.Doc;
+
+public static class DependencyInjection
+{
+    public static IServiceCollection AddDocInfrastructure(this IServiceCollection services)
+    {
+        services.AddScoped<IPdfPageImageRenderer, PdfPageImageRenderer>();
+        return services;
+    }
+}

EnvelopeGenerator.Infrastructure.Doc/EnvelopeGenerator.Infrastructure.Doc.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\EnvelopeGenerator.Application\EnvelopeGenerator.Application.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="DevExpress.Document.Processor" Version="25.2.3" />
+  </ItemGroup>
+
+</Project>

EnvelopeGenerator.Infrastructure.Doc/PdfPageImageRenderer.cs

@@ -0,0 +1,180 @@
+using DevExpress.Drawing;
+using DevExpress.Pdf;
+using DigitalData.Core.Exceptions;
+using EnvelopeGenerator.Application.Common.Dto;
+using EnvelopeGenerator.Application.Common.Interfaces.Doc;
+using EnvelopeGenerator.Domain.Interfaces;
+
+namespace EnvelopeGenerator.Infrastructure.Doc;
+
+public class PdfPageImageRenderer : IPdfPageImageRenderer
+{
+    private const float RenderDpi = 110f;
+
+    public Task<IReadOnlyList<PdfPageImageDto>> RenderPagesAsImagesAsync(byte[] pdfBytes, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(pdfBytes);
+
+        if (pdfBytes.Length == 0)
+            return Task.FromResult<IReadOnlyList<PdfPageImageDto>>(Array.Empty<PdfPageImageDto>());
+
+        using var stream = new MemoryStream(pdfBytes, writable: false);
+        using var processor = new PdfDocumentProcessor();
+        processor.LoadDocument(stream);
+
+        var pages = processor.Document.Pages;
+        if (pages.Count == 0)
+            return Task.FromResult<IReadOnlyList<PdfPageImageDto>>(Array.Empty<PdfPageImageDto>());
+
+        var renderOptions = PdfPageRenderingParameters.CreateWithResolution(RenderDpi);
+        var results = new List<PdfPageImageDto>(pages.Count);
+
+        for (var i = 0; i < pages.Count; i++)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            var pageNumber = i + 1;
+            var page = pages[i];
+            var cropBox = page.CropBox;
+
+            using DXBitmap bitmap = processor.CreateDXBitmap(pageNumber, renderOptions);
+            using var imageStream = new MemoryStream();
+            bitmap.Save(imageStream, DXImageFormat.Png);
+
+            var dataUrl = $"data:image/png;base64,{Convert.ToBase64String(imageStream.ToArray())}";
+
+            results.Add(new PdfPageImageDto
+            {
+                PageNumber = pageNumber,
+                WidthPt = cropBox.Width,
+                HeightPt = cropBox.Height,
+                WidthPx = bitmap.Width,
+                HeightPx = bitmap.Height,
+                ImageDataUrl = dataUrl
+            });
+        }
+
+        return Task.FromResult<IReadOnlyList<PdfPageImageDto>>(results);
+    }
+
+    public Stream ComposeSignaturePreviewPng(ISignatureInkPayload element)
+    {
+        const double sigW = 1.77 * 72;
+        const double sigH = 1.96 * 72;
+        const double imgRatio = 0.52;
+        const double lineH = 11.5;
+        const double bgPad = 3.0;
+        const double padding = 3.0;
+
+        var date = element.ChangedWhen!.Value.ToString("dd.MM.yyyy");
+        var position = string.IsNullOrWhiteSpace(element.Position) ? null : element.Position.Trim();
+
+        var x = bgPad;
+        var y = bgPad;
+        var imgH = sigH * imgRatio;
+        var lineY = y + imgH + 1.0;
+        var textY = lineY + 1.5;
+        var row1Y = textY;
+        var row2Y = row1Y + lineH;
+        var row3Y = position is null ? row2Y : row2Y + lineH;
+        var contentBottom = row3Y + lineH;
+        var pageWidth = sigW + (bgPad * 2);
+        var pageHeight = contentBottom + bgPad;
+
+        var inkBytes = this.EnsureSupportedImageBytes(element.Ink!);
+
+        using var processor = new PdfDocumentProcessor();
+        processor.CreateEmptyDocument();
+        var page = processor.AddNewPage(new PdfRectangle(0, 0, pageWidth, pageHeight));
+
+        using var graphics = processor.CreateGraphics();
+
+        using var bgBrush = new DXSolidBrush(System.Drawing.Color.FromArgb(255, 255, 253, 240));
+        using var linePen = new DXPen(System.Drawing.Color.FromArgb(180, 100, 100, 120), 0.5f);
+        using var nameBrush = new DXSolidBrush(System.Drawing.Color.FromArgb(255, 20, 20, 20));
+        using var infoBrush = new DXSolidBrush(System.Drawing.Color.FromArgb(255, 80, 80, 80));
+
+        var fontBold = new DXFont("Arial", 7.5f, DXFontStyle.Bold);
+        var fontNormal = new DXFont("Arial", 6.5f, DXFontStyle.Regular);
+
+        graphics.FillRectangle(bgBrush, new System.Drawing.RectangleF(0, 0, (float)pageWidth, (float)pageHeight));
+
+        var imageArea = new System.Drawing.RectangleF((float)x, (float)y, (float)sigW, (float)imgH);
+        var imageRect = FitImageContain(imageArea, inkBytes);
+        graphics.DrawImage(inkBytes, imageRect);
+
+        graphics.DrawLine(linePen, (float)(x + 2), (float)lineY, (float)(x + sigW - 2), (float)lineY);
+
+        graphics.DrawString(
+            element.FullName!.Trim(),
+            fontBold,
+            nameBrush,
+            new System.Drawing.RectangleF((float)(x + padding), (float)row1Y, (float)(sigW - (padding * 2)), (float)lineH));
+
+        if (position is not null)
+        {
+            graphics.DrawString(
+                position,
+                fontNormal,
+                infoBrush,
+                new System.Drawing.RectangleF((float)(x + padding), (float)row2Y, (float)(sigW - (padding * 2)), (float)lineH));
+        }
+
+        graphics.DrawString(
+            $"{element.Place!.Trim()}, {date}",
+            fontNormal,
+            infoBrush,
+            new System.Drawing.RectangleF((float)(x + padding), (float)row3Y, (float)(sigW - (padding * 2)), (float)lineH));
+
+        graphics.AddToPageForeground(page, 72, 72);
+
+        using var pdfStream = new MemoryStream();
+        processor.SaveDocument(pdfStream);
+        pdfStream.Position = 0;
+
+        using var rasterProcessor = new PdfDocumentProcessor();
+        rasterProcessor.LoadDocument(pdfStream);
+
+        var renderOptions = PdfPageRenderingParameters.CreateWithResolution(400f);
+        using DXBitmap bitmap = rasterProcessor.CreateDXBitmap(1, renderOptions);
+        var pngStream = new MemoryStream();
+        bitmap.Save(pngStream, DXImageFormat.Png);
+        pngStream.Position = 0;
+        return pngStream;
+    }
+
+    private static System.Drawing.RectangleF FitImageContain(System.Drawing.RectangleF area, byte[] imageBytes)
+    {
+        using var imageStream = new MemoryStream(imageBytes, writable: false);
+        using var image = DXImage.FromStream(imageStream);
+
+        if (image.Width <= 0 || image.Height <= 0)
+            return area;
+
+        var scale = Math.Min(area.Width / image.Width, area.Height / image.Height);
+        var drawW = image.Width * scale;
+        var drawH = image.Height * scale;
+        var drawX = area.X + ((area.Width - drawW) / 2f);
+        var drawY = area.Y + ((area.Height - drawH) / 2f);
+
+        return new System.Drawing.RectangleF(drawX, drawY, drawW, drawH);
+    }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="bytes"></param>
+    /// <returns></returns>
+    public bool IsSupportedImageFormat(byte[] bytes)
+    {
+        var isPng = bytes.Length >= 4 &&
+                    bytes[0] == 0x89 && bytes[1] == 0x50 && bytes[2] == 0x4E && bytes[3] == 0x47;
+        if (isPng)
+            return true;
+
+        var isJpeg = bytes.Length >= 3 &&
+                     bytes[0] == 0xFF && bytes[1] == 0xD8 && bytes[2] == 0xFF;
+        return isJpeg;
+    }
+
+}

EnvelopeGenerator.Infrastructure.Notification/Configuration/ConsumerType.cs

@@ -0,0 +1,7 @@
+namespace EnvelopeGenerator.Infrastructure.Notification.Configuration;
+
+public enum ConsumerType
+{
+    API,
+    RabbitMQ
+}

EnvelopeGenerator.Infrastructure.Notification/Configuration/NotificationOptions.cs

@@ -0,0 +1,16 @@
+using DigitalData.MessagingService.RabbitMQ;
+
+namespace EnvelopeGenerator.Infrastructure.Notification.Configuration;
+
+public class NotificationOptions
+{
+    public const string SectionName = "Notification";
+
+    public ConsumerType ConsumerType { get; set; }
+
+    public string? ApiUrl { get; set; }
+
+    public string SenderEmail { get; set; } = null!;
+
+    public RabbitMqConnectionConfiguration? RabbitMQ { get; set; }
+}

EnvelopeGenerator.Infrastructure.Notification/DependencyInjection.cs

@@ -0,0 +1,49 @@
+using DigitalData.MessagingService.Client;
+using EnvelopeGenerator.Application.Common.Interfaces.Services.Notification;
+using EnvelopeGenerator.Infrastructure.Notification.Configuration;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace EnvelopeGenerator.Infrastructure.Notification;
+
+public static class DependencyInjection
+{
+    public static IServiceCollection AddNotificationInfrastructure(this IServiceCollection services, IConfiguration configuration, string sectionName = NotificationOptions.SectionName)
+    {
+        var ntfConfiguration = configuration.GetSection(sectionName);
+        services.Configure<NotificationOptions>(ntfConfiguration);
+
+        var options = ntfConfiguration.Get<NotificationOptions>()
+            ?? throw new InvalidOperationException(
+                $"Failed to bind configuration section '{sectionName}' to {nameof(NotificationOptions)}. Ensure the section exists and is correctly configured.");
+
+        switch (options.ConsumerType)
+        {
+            case ConsumerType.API:
+                if (options.ApiUrl is string apiUrl)
+                    services.AddMessagingServiceHttpClient(opt =>
+                    {
+                        opt.BaseAddress = new Uri(apiUrl);
+                        // Additional configuration for the MessagingServiceHttpClient can be added here if needed
+                    });
+                else
+                    throw new InvalidOperationException(
+                        $"MessagingServiceApiUrl must be provided when ClientType is set to Api in the '{sectionName}' configuration section.");
+                break;
+            case ConsumerType.RabbitMQ:
+                if(options.RabbitMQ is not null)
+                    services.AddMessagingServiceClient(ntfConfiguration, nameof(options.RabbitMQ));
+                else
+                    throw new InvalidOperationException(
+                        $"Missing RabbitMQ connection configuration." +
+                        $"When ClientType is set to RabbitMQ, a valid RabbitMQ configuration must be provided in the '{sectionName}' configuration section.");
+                break;
+            default:
+                throw new InvalidOperationException(
+                    $"Unsupported ConsumerType '{options.ConsumerType}' in the '{sectionName}' configuration section.");
+        }
+
+        services.AddScoped<IEnvelopeNotificationService, EnvelopeNotificationService>();
+        return services;
+    }
+}

EnvelopeGenerator.Infrastructure.Notification/EnvelopeGenerator.Infrastructure.Notification.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+	<TargetFrameworks>net8.0;</TargetFrameworks>
+	<ImplicitUsings>enable</ImplicitUsings>
+	<Nullable>enable</Nullable>
+	<LangVersion>latest</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="DigitalData.MessagingService.Client" Version="3.0.1" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="10.0.10" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\EnvelopeGenerator.Application\EnvelopeGenerator.Application.csproj" />
+  </ItemGroup>
+
+</Project>

EnvelopeGenerator.Infrastructure.Notification/EnvelopeNotificationExtensions.cs

@@ -0,0 +1,15 @@
+using DigitalData.MessagingService.Application.Common.Dto;
+
+namespace EnvelopeGenerator.Infrastructure.Notification;
+
+public static class EnvelopeNotificationExtensions
+{
+    public static EmailAttachmentDto ToEmailAttachmentDto(this (string FileName, byte[] Content) attachment) => new()
+    {
+        FileName = attachment.FileName,
+        Content = attachment.Content
+    };
+
+    public static IEnumerable<EmailAttachmentDto> ToEmailAttachmentDto(this IEnumerable<(string FileName, byte[] Content)> attachments)
+        => attachments.Select(ToEmailAttachmentDto);
+}

EnvelopeGenerator.Infrastructure.Notification/EnvelopeNotificationService.cs

@@ -0,0 +1,45 @@
+using DigitalData.Core.Abstraction.Application.Repository;
+using DigitalData.MessagingService.Application.Common.Interfaces;
+using DigitalData.MessagingService.Application.EmailSending.Commands;
+using EnvelopeGenerator.Application.Common.Interfaces.Services.Notification;
+using EnvelopeGenerator.Domain.Constants;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Domain.Exceptions;
+using EnvelopeGenerator.Infrastructure.Notification.Configuration;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+
+namespace EnvelopeGenerator.Infrastructure.Notification;
+
+public class EnvelopeNotificationService(IRepository<EmailTemplate> TempRepo, IMessagingServiceClient MsgClient, IOptions<NotificationOptions> ntfOpt) : IEnvelopeNotificationService
+{    
+    private readonly NotificationOptions NtfOpt = ntfOpt.Value;
+
+    private async Task<EmailTemplate> GetTemplateAsync(EmailTemplateType templateType, CancellationToken cancel = default)
+    {
+        return await TempRepo.Where(t => t.Name == templateType.ToString()).FirstOrDefaultAsync(cancel)
+            ?? throw new DataIntegrityException($"{templateType} email template not found");
+    }
+
+    public async Task Notify<TEnvelopeNotificationBase>(string receiverEmail, TEnvelopeNotificationBase notification, CancellationToken cancel = default)
+        where TEnvelopeNotificationBase : EnvelopeNotificationBase
+    {
+        var template = await GetTemplateAsync(notification.GetTemplateType(), cancel);
+
+        // create email command
+        var mail = new PublishEmailViaSmtpCommand()
+        {
+            Body = template.Body.ReplacePlaceholders(notification),
+            Subject = template.Subject.ReplacePlaceholders(notification),
+            Recipients = [receiverEmail],
+            Sender = NtfOpt.SenderEmail.ToSender(),
+            IsHtml = true
+        };
+
+        // add attachments if any
+        if(notification.Attachments?.Any() ?? false)
+            mail = mail.WithAttachments(notification.Attachments.ToEmailAttachmentDto());
+
+        await MsgClient.SendAsync(mail, cancel);
+    }
+}

EnvelopeGenerator.Infrastructure.Notification/ReplacePlaceholderExtensions.cs

@@ -0,0 +1,47 @@
+using System.Collections.Concurrent;
+using System.Reflection;
+using System.Text.RegularExpressions;
+
+namespace EnvelopeGenerator.Infrastructure.Notification;
+
+public static class ReplacePlaceholderExtensions
+{
+    private sealed record PlaceholderProperty(string Placeholder, PropertyInfo Property);
+
+    private static readonly ConcurrentDictionary<Type, PlaceholderProperty[]> PropertyCache = new();
+
+    public static string ReplacePlaceholders(this string template, object data)
+    {
+        var properties = PropertyCache.GetOrAdd(data.GetType(), CreatePlaceholderProperties);
+
+        foreach (var item in properties)
+        {
+            var value = item.Property.GetValue(data)?.ToString() ?? string.Empty;
+            template = template.Replace(
+                item.Placeholder,
+                value,
+                StringComparison.Ordinal);
+        }
+
+        return template;
+    }
+
+    private static PlaceholderProperty[] CreatePlaceholderProperties(
+        Type type)
+    {
+        return [.. type
+            .GetProperties(BindingFlags.Public | BindingFlags.Instance)
+            .Where(p => p.CanRead && p.GetIndexParameters().Length == 0)
+            .Select(p => new PlaceholderProperty(
+                $"[{ToCapitalSnakeCase(p.Name)}]",
+                p))];
+    }
+
+    private static string ToCapitalSnakeCase(string name)
+    {
+        return Regex.Replace(
+            Regex.Replace(name, @"([A-Z]+)([A-Z][a-z])", "$1_$2"),
+            @"([a-z0-9])([A-Z])",
+            "$1_$2").ToUpperInvariant();
+    }
+}

EnvelopeGenerator.Server/EmailTemplateBackups/DocumentAccessCodeReceived_original.sql

@@ -0,0 +1,17 @@
+-- Original email template: DocumentAccessCodeReceived (GUID 5)
+-- Backed up before redesign: 2026-10-29 16:32:15
+-- Subject: Zugriffscode für Dokument erhalten: ''[DOCUMENT_TITLE]''
+-- Restore by running this script against DD_ECM:
+UPDATE dbo.TBSIG_EMAIL_TEMPLATE
+SET BODY = N'Guten Tag [NAME_RECEIVER],<br />
+<br /><B><I>
+[NAME_SENDER]</I></B> hat Ihnen ein Dokument zum [SIGNATURE_TYPE] gesendet. <br />
+<br />
+Verwenden Sie den folgenden Zugriffscode, um das Dokument einzusehen:<br />
+<br />
+[DOCUMENT_ACCESS_CODE]<br />
+<br />
+Mit freundlichen Grüßen<br />
+<br />
+[NAME_PORTAL]'
+WHERE GUID = 5;

EnvelopeGenerator.Server/EmailTemplateBackups/DocumentCompleted_original.sql

@@ -0,0 +1,15 @@
+-- Original email template: DocumentCompleted (GUID 4)
+-- Backed up before redesign: 2026-10-29 16:29:55
+-- Subject: Umschlag abgeschlossen: ''[DOCUMENT_TITLE]''
+-- Restore by running this script against DD_ECM:
+UPDATE dbo.TBSIG_EMAIL_TEMPLATE
+SET BODY = N'Guten Tag [NAME_RECEIVER],<br />
+<br />
+Der Vorgang <B><I>''[DOCUMENT_TITLE]''</I></B> wurde erfolgreich abgeschlossen.<br />
+<br />
+Sie erhalten das Dokument mit einem detaillierten Ergebnisbericht als Anhang zu dieser Email.<br />
+<br />
+Mit freundlichen Grüßen<br />
+<br />
+[NAME_PORTAL]'
+WHERE GUID = 4;

EnvelopeGenerator.Server/EmailTemplateBackups/DocumentDeleted_original.sql

@@ -0,0 +1,13 @@
+-- Original email template: DocumentDeleted (GUID 2)
+-- Backed up before redesign: 2026-10-29 16:23:45
+-- Subject: Umschlag zurückgezogen: ''[DOCUMENT_TITLE]''
+-- Restore by running this script against DD_ECM:
+UPDATE dbo.TBSIG_EMAIL_TEMPLATE
+SET BODY = N'Guten Tag [NAME_RECEIVER],<br />
+<br /><B><I>
+[NAME_SENDER]</I></B> hat den Umschlag <B><I>''[DOCUMENT_TITLE]''</I></B> gelöscht/zurückgezogen.<br /><p>
+Begründung: <br /> <I>[REASON]</I> <p>
+<br />
+Mit freundlichen Grüßen<br />
+<br />
+[NAME_PORTAL]'

EnvelopeGenerator.Server/EmailTemplateBackups/DocumentReceived_original.sql

@@ -0,0 +1,17 @@
+-- Original email template: DocumentReceived (GUID 1, de-DE)
+-- Backed up before redesign: 2026-10-29 16:06:07
+-- Subject: Dokument erhalten: ''[DOCUMENT_TITLE]''
+-- Restore by running this script against DD_ECM:
+UPDATE dbo.TBSIG_EMAIL_TEMPLATE
+SET BODY = N'Guten Tag [NAME_RECEIVER],<br />
+<br /><B><I>
+[NAME_SENDER]</I></B> hat Ihnen ein Dokument zum [SIGNATURE_TYPE] gesendet.<br />
+<br />
+Über den folgenden Link können Sie das Dokument einsehen[DOCUMENT_PROCESS]: <a href="[LINK_TO_DOCUMENT]">[LINK_TO_DOCUMENT_TEXT]</a><br />
+<br />
+[MESSAGE]<br />
+<br />
+Mit freundlichen Grüßen<br />
+<br />
+[NAME_PORTAL]'
+WHERE GUID = 1;

EnvelopeGenerator.Server/EmailTemplateBackups/DocumentRejected_ADM_original.sql

@@ -0,0 +1,12 @@
+-- Original email template: DocumentRejected_ADM (GUID 6)
+-- Backed up before redesign: 2026-10-29 16:33:34
+-- Subject: ''[DOCUMENT_TITLE]'' - Vorgang zurückgezogen
+-- Restore by running this script against DD_ECM:
+UPDATE dbo.TBSIG_EMAIL_TEMPLATE
+SET BODY = N'Guten Tag [NAME_SENDER],<p><B><I>[NAME_RECEIVER]</I></B> hat den Umschlag <B><I>''[DOCUMENT_TITLE]''</I></B> mit folgendem Grund abgelehnt: <p>
+[REASON] 
+<p>Der Umschlag wurde auf den Status Rejected gesetzt. <p> 
+Mit freundlichen Grüßen<br />
+<br />
+[NAME_PORTAL]'
+WHERE GUID = 6;

EnvelopeGenerator.Server/EmailTemplateBackups/DocumentRejected_REC_2_original.sql

@@ -0,0 +1,11 @@
+-- Original email template: DocumentRejected_REC_2 (GUID 10)
+-- Backed up before redesign: 2026-10-29 16:37:12
+-- Subject: ''[DOCUMENT_TITLE]'' - Vorgang abgelehnt.
+-- Restore by running this script against DD_ECM:
+UPDATE dbo.TBSIG_EMAIL_TEMPLATE
+SET BODY = N'Guten Tag [NAME_RECEIVER],
+<p>Der Vorgang <B><I>''[DOCUMENT_TITLE]''</I></B> wurde durch einen anderen Vertragspartner abgelehnt.<p> Der Absender <B><I>[NAME_SENDER]</I></B> wird sich bei Bedarf mit Ihnen in Verbindung setzen. <p> 
+Mit freundlichen Grüßen<br />
+<br />
+[NAME_PORTAL]'
+WHERE GUID = 10;

EnvelopeGenerator.Server/EmailTemplateBackups/DocumentRejected_REC_original.sql

@@ -0,0 +1,11 @@
+-- Original email template: DocumentRejected_REC (GUID 9)
+-- Backed up before redesign: 2026-10-29 16:34:21
+-- Subject: ''[DOCUMENT_TITLE]'' - Bestätigung der Ablehnung
+-- Restore by running this script against DD_ECM:
+UPDATE dbo.TBSIG_EMAIL_TEMPLATE
+SET BODY = N'Guten Tag [NAME_RECEIVER],
+<p>Hiermit bestätigen wir Ihnen die Ablehnung des Vorgangs <B><I>''[DOCUMENT_TITLE]''</I></B>!<p>Der Absender <B><I>[NAME_SENDER]</I></B> wurde über die Ablehnung informiert. <p> 
+Mit freundlichen Grüßen<br />
+<br />
+[NAME_PORTAL]'
+WHERE GUID = 9;

EnvelopeGenerator.Server/EmailTemplateBackups/DocumentShared_original.sql

@@ -0,0 +1,7 @@
+-- Original email template: DocumentShared (GUID 11)
+-- Backed up before redesign: 2026-10-29 16:42:51
+-- Subject: Dokument geteilt: ''[DOCUMENT_TITLE]''
+-- Restore by running this script against DD_ECM:
+UPDATE dbo.TBSIG_EMAIL_TEMPLATE
+SET BODY = N'Guten Tag,<br />  <br /><B><I>  [NAME_RECEIVER]</I></B> hat Ihnen ein Dokument zum Ansehen gesendet.<br />  <br />  Über den folgenden Link können Sie das Dokument einsehen: <a href="[LINK_TO_DOCUMENT]">[LINK_TO_DOCUMENT_TEXT]</a><br /> <br />  <br />  Mit freundlichen Grüßen<br />  <br />  [NAME_PORTAL]'
+WHERE GUID = 11;

EnvelopeGenerator.Server/EmailTemplateBackups/DocumentSigned_original.sql

@@ -0,0 +1,14 @@
+-- Original email template: DocumentSigned (GUID 3)
+-- Backed up before redesign: 2026-10-29 16:25:45
+-- Subject: Dokument [RECEIVER_ACTION]: ''[DOCUMENT_TITLE]''
+-- Restore by running this script against DD_ECM:
+UPDATE dbo.TBSIG_EMAIL_TEMPLATE
+SET BODY = N'Guten Tag [NAME_RECEIVER],<br />
+<br />
+hiermit bestätigen wir Ihnen die erfolgreiche [FINAL_STATUS] für den Vorgang <B><I>''[DOCUMENT_TITLE]''</I></B>.<br />
+Wenn alle [FINAL_ACTION] haben, erhalten Sie ebenfalls per E-Mail ein abgeschlossenes Exemplar mit entsprechendem Zertifikat!
+<br />
+Mit freundlichen Grüßen<br />
+<br />
+[NAME_PORTAL]'
+WHERE GUID = 3;

EnvelopeGenerator.Server/EmailTemplateBackups/TotpSecret_original.sql

@@ -0,0 +1,8 @@
+-- Original email template: TotpSecret (GUID 12)
+-- Backed up before redesign: 2026-10-29 16:44:44
+-- Subject: 2-Faktor-Authentifizierung QR-Code
+-- Restore by running this script against DD_ECM:
+UPDATE dbo.TBSIG_EMAIL_TEMPLATE
+SET BODY = N'Guten Tag,<br /> <br />Sie können auf Ihren Zwei-Faktor-Authentifizierungscode zugreifen, indem Sie den unten stehenden QR-Code mit einer beliebigen Authentifizierungs-App auf Ihrem Telefon scannen (Google Authenticator, Microsoft Authenticator usw.). Dieser Code ist bis zum [TFA_EXPIRATION] gültig.<br /> <br /> <img src="data:image/png;base64,[TFA_QR_CODE]" style="width: 13rem; height: 13rem;"><br /> <br />
+<br /> Mit freundlichen Grüßen<br /> <br /> [NAME_PORTAL]'
+WHERE GUID = 12;

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Components/PdfEditor/SenderPdfFieldMoveRequest.cs

@@ -0,0 +1,7 @@
+namespace EnvelopeGenerator.Server.Client.Components.PdfEditor;
+
+public sealed record SenderPdfFieldMoveRequest(
+    int Index,
+    int Page,
+    double XPt,
+    double YPt);

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Components/PdfEditor/SenderPdfFieldOverlay.cs

@@ -0,0 +1,9 @@
+namespace EnvelopeGenerator.Server.Client.Components.PdfEditor;
+
+public sealed record SenderPdfFieldOverlay(
+    int Index,
+    int Page,
+    double XPt,
+    double YPt,
+    string ReceiverName,
+    string Color);

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Components/PdfEditor/SenderPdfImageEditor.razor

@@ -0,0 +1,458 @@
+@using EnvelopeGenerator.Application.Resources
+@using EnvelopeGenerator.Application.Common.Dto
+@using System.Globalization
+@using Microsoft.AspNetCore.Components.Web
+@using Microsoft.Extensions.Localization
+@inject IStringLocalizer<Resource> UiLocalizer
+@inject IJSRuntime JSRuntime
+
+<div class="sender-image-editor-shell">
+    @if (PageCount > 0)
+    {
+        <div class="sender-image-editor__toolbar-host">
+            <SenderPdfImageEditorToolbar CurrentPage="@_currentPage"
+                                        TotalPages="@PageCount"
+                                        ZoomPercent="@_zoomPercent"
+                                        MinZoomPercent="@MinZoomPercent"
+                                        MaxZoomPercent="@MaxZoomPercent"
+                                        ZoomStepPercent="@ZoomStepPercent"
+                                        GoFirstPage="OnGoFirstPageAsync"
+                                        GoPreviousPage="OnGoPreviousPageAsync"
+                                        GoNextPage="OnGoNextPageAsync"
+                                        GoLastPage="OnGoLastPageAsync"
+                                        GoToPage="OnGoToPageAsync"
+                                        ZoomOut="OnZoomOutAsync"
+                                        ZoomIn="OnZoomInAsync"
+                                        SetZoomPercent="OnSetZoomPercentAsync"
+                                        CanDownloadPdf="@CanDownloadPdf"
+                                        CanPrintPdf="@CanPrintPdf"
+                                        IsDownloading="@_isDownloading"
+                                        IsPrinting="@_isPrinting"
+                                        DownloadPdf="OnDownloadPdfAsync"
+                                        PrintPdf="OnPrintPdfAsync" />
+        </div>
+    }
+
+    <div class="pdf-editor-wrapper sender-image-editor sender-editor-pdf-viewer"
+         style="cursor: @(IsPlacementMode ? "crosshair" : (_isDragging ? "grabbing" : "default"));"
+         tabindex="0"
+         @onclick="HandleClickAsync"
+         @onwheel="OnEditorWheelAsync"
+         @onwheel:preventDefault="true"
+         @onscroll="OnEditorScrollAsync"
+         @onmousemove="OnEditorMouseMoveAsync"
+         @onmouseup="OnEditorMouseUp"
+         @onmouseleave="OnEditorMouseUp">
+        @if (PageCount <= 0)
+        {
+            <div class="sender-image-editor__empty">@L("SenderEditor_NoPagesToDisplay", "Keine Seiten zur Anzeige verfügbar.")</div>
+        }
+        else if (Pages.Count == 0 && !string.IsNullOrWhiteSpace(PdfDataUrl))
+        {
+            <div class="sender-image-editor__native-preview" style="@GetZoomStyle()">
+                <iframe class="sender-image-editor__native-frame"
+                        src="@PdfDataUrl"
+                        title="PDF Preview"></iframe>
+            </div>
+        }
+        else
+        {
+            <div class="sender-image-editor__pages" style="@GetZoomStyle()">
+                @for (var pageIndex = 0; pageIndex < PageCount; pageIndex++)
+                {
+                    var pagePreview = pageIndex < Pages.Count ? Pages[pageIndex] : null;
+                    var pageNumber = pagePreview?.PageNumber ?? (pageIndex + 1);
+                    var widthPt = pagePreview?.WidthPt ?? 595.0;
+                    var heightPt = pagePreview?.HeightPt ?? 842.0;
+
+                    <div class="sender-image-editor__page-block"
+                         data-editor-page="@pageNumber"
+                         data-page-width-pt="@widthPt"
+                         data-page-height-pt="@heightPt">
+                        <div class="sender-image-editor__page-canvas"
+                             data-editor-page-canvas="@pageNumber"
+                             style="@GetPageCanvasStyle(widthPt, heightPt)">
+                            @if (!string.IsNullOrWhiteSpace(pagePreview?.ImageDataUrl))
+                            {
+                                <img class="sender-image-editor__page-image"
+                                     src="@(pagePreview!.ImageDataUrl)"
+                                     alt="PDF Page @pageNumber"
+                                     draggable="false" />
+                            }
+                            else
+                            {
+                                <div class="sender-image-editor__page-placeholder">@L("SenderEditor_PageLabel", "Seite") @pageNumber</div>
+                            }
+
+                            @foreach (var field in Fields.Where(f => f.Page == pageNumber))
+                            {
+                                <div class="sender-image-editor__field"
+                                     style="@GetFieldStyle(field, widthPt, heightPt)"
+                                     title="@field.ReceiverName"
+                                     @onmousedown="args => OnFieldMouseDownAsync(args, field)"
+                                     @onmousedown:preventDefault="true"
+                                     @onclick:stopPropagation="true">
+                                    <span class="sender-image-editor__field-label">@field.ReceiverName</span>
+                                    <button type="button"
+                                            class="sender-image-editor__field-remove"
+                                            title='@L("Delete", "Löschen")'
+                                            draggable="false"
+                                            @onclick:stopPropagation="true"
+                                            @onclick="() => RemoveField.InvokeAsync(field.Index)">
+                                        <svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 16 16" fill="none" aria-hidden="true">
+                                            <path d="M4 4L12 12M12 4L4 12" stroke="currentColor" stroke-width="2" stroke-linecap="round" />
+                                        </svg>
+                                    </button>
+                                </div>
+                            }
+                        </div>
+                    </div>
+                }
+            </div>
+        }
+    </div>
+</div>
+
+@code {
+    [Parameter]
+    public bool IsPlacementMode { get; set; }
+
+    [Parameter]
+    public int PageCount { get; set; }
+
+    [Parameter]
+    public IReadOnlyList<PdfPageImageDto> Pages { get; set; } = Array.Empty<PdfPageImageDto>();
+
+    [Parameter]
+    public string? PdfDataUrl { get; set; }
+
+    [Parameter]
+    public string? PdfFileName { get; set; }
+
+    [Parameter]
+    public IReadOnlyList<SenderPdfFieldOverlay> Fields { get; set; } = Array.Empty<SenderPdfFieldOverlay>();
+
+    [Parameter]
+    public EventCallback<MouseEventArgs> EditorClick { get; set; }
+
+    [Parameter]
+    public EventCallback<int> RemoveField { get; set; }
+
+    [Parameter]
+    public EventCallback<SenderPdfFieldMoveRequest> MoveField { get; set; }
+
+    private int? _draggedFieldIndex;
+    private bool _isDragging;
+    private double _grabOffsetXPt;
+    private double _grabOffsetYPt;
+    private int _currentPage = 1;
+    private int _zoomPercent = 112;
+    private bool _zoomOverrideInitialized;
+    private bool _isDownloading;
+    private bool _isPrinting;
+
+    private const int MinZoomPercent = 50;
+    private const int MaxZoomPercent = 300;
+    private const int ZoomStepPercent = 5;
+    private bool CanDownloadPdf => !string.IsNullOrWhiteSpace(PdfDataUrl);
+    private bool CanPrintPdf => !string.IsNullOrWhiteSpace(PdfDataUrl);
+
+    private static string GetFieldStyle(SenderPdfFieldOverlay field, double pageWidthPt, double pageHeightPt)
+    {
+        var leftPercent = (field.XPt / pageWidthPt) * 100.0;
+        var topPercent = (field.YPt / pageHeightPt) * 100.0;
+        var widthPercent = (127.44 / pageWidthPt) * 100.0;
+        var heightPercent = (141.12 / pageHeightPt) * 100.0;
+
+        var left = leftPercent.ToString("F4", CultureInfo.InvariantCulture);
+        var top = topPercent.ToString("F4", CultureInfo.InvariantCulture);
+        var width = widthPercent.ToString("F4", CultureInfo.InvariantCulture);
+        var height = heightPercent.ToString("F4", CultureInfo.InvariantCulture);
+
+        return string.Join(' ',
+            "position:absolute;",
+            $"left:{left}%;",
+            $"top:{top}%;",
+            $"width:{width}%;",
+            $"height:{height}%;",
+            "border:2px solid;",
+            "border-radius:8px;",
+            "display:flex;",
+            "align-items:flex-start;",
+            "justify-content:space-between;",
+            "gap:0.35rem;",
+            "padding:0.2rem 0.3rem;",
+            "overflow:hidden;",
+            "z-index:30;",
+            $"border-color:{field.Color};",
+            $"background-color:{field.Color}22;");
+    }
+
+    private string GetPageCanvasStyle(double pageWidthPt, double pageHeightPt)
+    {
+        var ratio = pageHeightPt <= 0 ? 595.0 / 842.0 : pageWidthPt / pageHeightPt;
+        var ratioText = ratio.ToString("F6", CultureInfo.InvariantCulture);
+        var cursor = _isDragging
+            ? "grabbing"
+            : (IsPlacementMode ? "crosshair" : "default");
+        return $"aspect-ratio:{ratioText};cursor:{cursor};";
+    }
+
+    private string GetZoomStyle()
+    {
+        var factor = (_zoomPercent / 100.0).ToString("F4", CultureInfo.InvariantCulture);
+        return $"zoom:{factor};";
+    }
+
+    protected override void OnParametersSet()
+    {
+        if (PageCount <= 0)
+        {
+            _currentPage = 1;
+            return;
+        }
+
+        _currentPage = Math.Max(1, Math.Min(_currentPage, PageCount));
+    }
+
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (_zoomOverrideInitialized)
+            return;
+
+        await JSRuntime.InvokeVoidAsync(
+            "envelopeEditor.ensureZoomOverride",
+            "sender-editor-pdf-viewer");
+
+        _zoomOverrideInitialized = true;
+    }
+
+    private async Task HandleClickAsync(MouseEventArgs args)
+    {
+        if (EditorClick.HasDelegate)
+            await EditorClick.InvokeAsync(args);
+    }
+
+    private async Task OnFieldMouseDownAsync(MouseEventArgs args, SenderPdfFieldOverlay field)
+    {
+        var coords = await JSRuntime.InvokeAsync<EditorCoords?>(
+            "envelopeEditor.getClickCoordsOnPdfPage",
+            "sender-editor-pdf-viewer",
+            args.ClientX,
+            args.ClientY);
+
+        if (coords is null)
+            return;
+
+        var pageNumber = coords.PageNumber;
+        var (pageWidthPt, pageHeightPt) = GetPageSize(pageNumber);
+        var pointerXPt = coords.NormX * pageWidthPt;
+        var pointerYPt = coords.NormY * pageHeightPt;
+
+        _draggedFieldIndex = field.Index;
+        _isDragging = true;
+        _grabOffsetXPt = pointerXPt - field.XPt;
+        _grabOffsetYPt = pointerYPt - field.YPt;
+    }
+
+    private async Task OnEditorMouseMoveAsync(MouseEventArgs args)
+    {
+        if (_draggedFieldIndex is null || !MoveField.HasDelegate)
+            return;
+
+        var coords = await JSRuntime.InvokeAsync<EditorCoords?>(
+            "envelopeEditor.getClickCoordsOnPdfPage",
+            "sender-editor-pdf-viewer",
+            args.ClientX,
+            args.ClientY);
+
+        if (coords is null)
+            return;
+
+        var pageNumber = coords.PageNumber;
+        var (pageWidthPt, pageHeightPt) = GetPageSize(pageNumber);
+
+        const double sigWidthPt = 1.77 * 72;
+        const double sigHeightPt = 1.96 * 72;
+
+        var xPt = (coords.NormX * pageWidthPt) - _grabOffsetXPt;
+        var yPt = (coords.NormY * pageHeightPt) - _grabOffsetYPt;
+        xPt = Math.Max(0, Math.Min(xPt, pageWidthPt - sigWidthPt));
+        yPt = Math.Max(0, Math.Min(yPt, pageHeightPt - sigHeightPt));
+
+        await MoveField.InvokeAsync(new SenderPdfFieldMoveRequest(_draggedFieldIndex.Value, pageNumber, xPt, yPt));
+    }
+
+    private async Task OnGoFirstPageAsync()
+    {
+        await NavigateToPageAsync(1);
+    }
+
+    private async Task OnGoPreviousPageAsync()
+    {
+        await NavigateToPageAsync(_currentPage - 1);
+    }
+
+    private async Task OnGoNextPageAsync()
+    {
+        await NavigateToPageAsync(_currentPage + 1);
+    }
+
+    private async Task OnGoLastPageAsync()
+    {
+        await NavigateToPageAsync(PageCount);
+    }
+
+    private async Task OnGoToPageAsync(int page)
+    {
+        await NavigateToPageAsync(page);
+    }
+
+    private async Task NavigateToPageAsync(int targetPage)
+    {
+        if (PageCount <= 0)
+            return;
+
+        var page = Math.Max(1, Math.Min(targetPage, PageCount));
+        _currentPage = page;
+
+        await JSRuntime.InvokeVoidAsync(
+            "envelopeEditor.scrollToPdfPage",
+            "sender-editor-pdf-viewer",
+            page);
+    }
+
+    private async Task OnEditorScrollAsync(EventArgs _)
+    {
+        if (PageCount <= 0)
+            return;
+
+        var visiblePage = await JSRuntime.InvokeAsync<int?>(
+            "envelopeEditor.getVisiblePdfPageNumber",
+            "sender-editor-pdf-viewer");
+
+        if (!visiblePage.HasValue)
+            return;
+
+        var clamped = Math.Max(1, Math.Min(visiblePage.Value, PageCount));
+        if (clamped == _currentPage)
+            return;
+
+        _currentPage = clamped;
+        await InvokeAsync(StateHasChanged);
+    }
+
+    private async Task OnZoomOutAsync()
+    {
+        SetZoomPercent(_zoomPercent - ZoomStepPercent);
+        await InvokeAsync(StateHasChanged);
+    }
+
+    private async Task OnZoomInAsync()
+    {
+        SetZoomPercent(_zoomPercent + ZoomStepPercent);
+        await InvokeAsync(StateHasChanged);
+    }
+
+    private async Task OnSetZoomPercentAsync(int zoomPercent)
+    {
+        SetZoomPercent(zoomPercent);
+        await InvokeAsync(StateHasChanged);
+    }
+
+    private async Task OnEditorWheelAsync(WheelEventArgs args)
+    {
+        if (args.CtrlKey)
+        {
+            if (args.DeltaY < 0)
+                await OnZoomInAsync();
+            else if (args.DeltaY > 0)
+                await OnZoomOutAsync();
+
+            return;
+        }
+
+        await JSRuntime.InvokeVoidAsync(
+            "envelopeEditor.scrollPdfViewerByDelta",
+            "sender-editor-pdf-viewer",
+            args.DeltaY);
+    }
+
+    private void SetZoomPercent(int value)
+    {
+        _zoomPercent = Math.Max(MinZoomPercent, Math.Min(value, MaxZoomPercent));
+    }
+
+    private async Task OnDownloadPdfAsync()
+    {
+        if (string.IsNullOrWhiteSpace(PdfDataUrl) || _isDownloading || _isPrinting)
+            return;
+
+        _isDownloading = true;
+        await InvokeAsync(StateHasChanged);
+
+        try
+        {
+            var fallbackName = string.IsNullOrWhiteSpace(PdfFileName)
+                ? "document.pdf"
+                : PdfFileName;
+
+            var fileName = fallbackName.EndsWith(".pdf", StringComparison.OrdinalIgnoreCase)
+                ? fallbackName
+                : $"{fallbackName}.pdf";
+
+            await JSRuntime.InvokeVoidAsync(
+                "envelopeEditor.downloadDataUrlAsFile",
+                PdfDataUrl,
+                fileName,
+                "application/pdf");
+        }
+        finally
+        {
+            _isDownloading = false;
+            await InvokeAsync(StateHasChanged);
+        }
+    }
+
+    private async Task OnPrintPdfAsync()
+    {
+        if (string.IsNullOrWhiteSpace(PdfDataUrl) || _isPrinting || _isDownloading)
+            return;
+
+        _isPrinting = true;
+        await InvokeAsync(StateHasChanged);
+
+        try
+        {
+            await JSRuntime.InvokeVoidAsync(
+                "envelopeEditor.printDataUrlPdf",
+                PdfDataUrl,
+                "application/pdf");
+        }
+        finally
+        {
+            _isPrinting = false;
+            await InvokeAsync(StateHasChanged);
+        }
+    }
+
+    private void OnEditorMouseUp(MouseEventArgs args)
+    {
+        _draggedFieldIndex = null;
+        _isDragging = false;
+    }
+
+    private (double WidthPt, double HeightPt) GetPageSize(int pageNumber)
+    {
+        var page = Pages.FirstOrDefault(p => p.PageNumber == pageNumber);
+        return page is null ? (595.0, 842.0) : (page.WidthPt, page.HeightPt);
+    }
+
+    private sealed record EditorCoords(double NormX, double NormY, int PageIndex, int PageNumber);
+
+    private string L(string key, string fallback)
+    {
+        var value = UiLocalizer[key];
+        return value.ResourceNotFound ? fallback : value.Value;
+    }
+}

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Components/PdfEditor/SenderPdfImageEditorToolbar.razor

@@ -0,0 +1,267 @@
+<div class="sender-image-toolbar" @onclick:stopPropagation="true">
+    <div class="sender-image-toolbar__group sender-image-toolbar__group--nav" role="group" aria-label="Page navigation">
+        <button type="button" class="sender-image-toolbar__icon-btn" title="First page" disabled="@(!CanGoPrevious)" @onclick="GoToFirstAsync">
+            <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+                <path d="M8 6V18" stroke="currentColor" stroke-width="2" stroke-linecap="round" />
+                <path d="M16 7L11 12L16 17" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
+            </svg>
+        </button>
+
+        <button type="button" class="sender-image-toolbar__icon-btn" title="Previous page" disabled="@(!CanGoPrevious)" @onclick="GoToPreviousAsync">
+            <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+                <path d="M15 7L10 12L15 17" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
+            </svg>
+        </button>
+
+        <div class="sender-image-toolbar__value-box">
+            <input type="number"
+                   min="1"
+                   max="@TotalPagesDisplay"
+                   value="@CurrentPageDisplay"
+                   class="sender-image-toolbar__page-input"
+                   @onchange="OnPageInputChangedAsync"
+                   disabled="@(TotalPagesDisplay <= 0)" />
+            <span class="sender-image-toolbar__page-total">of @TotalPagesDisplay</span>
+        </div>
+
+        <div class="sender-image-toolbar__select-wrap" title="Page list">
+            <button type="button" class="sender-image-toolbar__icon-btn sender-image-toolbar__icon-btn--caret" disabled="@(TotalPagesDisplay <= 0)">
+                <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+                    <path d="M6 9L12 15L18 9" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
+                </svg>
+            </button>
+
+            <select class="sender-image-toolbar__page-select"
+                    aria-label="Select page"
+                    disabled="@(TotalPagesDisplay <= 0)"
+                    value="@CurrentPageDisplay"
+                    @onchange="OnPageSelectChangedAsync">
+                @for (var pageNumber = 1; pageNumber <= TotalPagesDisplay; pageNumber++)
+                {
+                    <option value="@pageNumber">@pageNumber</option>
+                }
+            </select>
+        </div>
+
+        <button type="button" class="sender-image-toolbar__icon-btn" title="Next page" disabled="@(!CanGoNext)" @onclick="GoToNextAsync">
+            <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+                <path d="M9 7L14 12L9 17" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
+            </svg>
+        </button>
+
+        <button type="button" class="sender-image-toolbar__icon-btn" title="Last page" disabled="@(!CanGoNext)" @onclick="GoToLastAsync">
+            <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+                <path d="M16 6V18" stroke="currentColor" stroke-width="2" stroke-linecap="round" />
+                <path d="M8 7L13 12L8 17" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
+            </svg>
+        </button>
+    </div>
+
+    <div class="sender-image-toolbar__group sender-image-toolbar__group--zoom" role="group" aria-label="Zoom controls">
+        <button type="button" class="sender-image-toolbar__icon-btn" title="Zoom out" disabled="@(!CanZoomOut)" @onclick="ZoomOutAsync">
+            <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+                <path d="M6 12H18" stroke="currentColor" stroke-width="2" stroke-linecap="round" />
+            </svg>
+        </button>
+
+        <div class="sender-image-toolbar__value-box" aria-hidden="true">
+            <span>@ZoomPercentDisplay%</span>
+        </div>
+
+        <input type="range"
+               class="sender-image-toolbar__zoom-slider"
+               min="@MinZoomPercent"
+               max="@MaxZoomPercent"
+               step="@ZoomStepPercent"
+               value="@ZoomPercentDisplay"
+               @oninput="OnZoomSliderInputAsync"
+               aria-label="Zoom slider" />
+
+        <button type="button" class="sender-image-toolbar__icon-btn" title="Zoom in" disabled="@(!CanZoomIn)" @onclick="ZoomInAsync">
+            <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+                <path d="M12 6V18" stroke="currentColor" stroke-width="2" stroke-linecap="round" />
+                <path d="M6 12H18" stroke="currentColor" stroke-width="2" stroke-linecap="round" />
+            </svg>
+        </button>
+    </div>
+
+    <div class="sender-image-toolbar__group sender-image-toolbar__group--actions" role="group" aria-label="Document actions">
+        <button type="button"
+                class="sender-image-toolbar__icon-btn @(IsPrinting ? "sender-image-toolbar__icon-btn--busy" : string.Empty)"
+                title="@(IsPrinting ? "Preparing print..." : "Print")"
+                disabled="@(!CanPrintPdf || IsPrinting || IsDownloading)"
+                @onclick="PrintPdfAsync">
+            <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+                <path d="M7 9V4H17V9" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
+                <rect x="5" y="9" width="14" height="8" rx="2" stroke="currentColor" stroke-width="2" />
+                <path d="M7 14H17V20H7V14Z" stroke="currentColor" stroke-width="2" stroke-linejoin="round" />
+            </svg>
+        </button>
+
+        <button type="button"
+                class="sender-image-toolbar__icon-btn @(IsDownloading ? "sender-image-toolbar__icon-btn--busy" : string.Empty)"
+                title="@(IsDownloading ? "Preparing download..." : "Download PDF")"
+                disabled="@(!CanDownloadPdf || IsDownloading || IsPrinting)"
+                @onclick="DownloadPdfAsync">
+            <svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+                <path d="M12 4V14" stroke="currentColor" stroke-width="2" stroke-linecap="round" />
+                <path d="M8 10L12 14L16 10" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
+                <path d="M5 18H19" stroke="currentColor" stroke-width="2" stroke-linecap="round" />
+            </svg>
+        </button>
+    </div>
+</div>
+
+@code {
+    [Parameter]
+    public int CurrentPage { get; set; }
+
+    [Parameter]
+    public int TotalPages { get; set; }
+
+    [Parameter]
+    public int ZoomPercent { get; set; } = 112;
+
+    [Parameter]
+    public int MinZoomPercent { get; set; } = 50;
+
+    [Parameter]
+    public int MaxZoomPercent { get; set; } = 300;
+
+    [Parameter]
+    public int ZoomStepPercent { get; set; } = 5;
+
+    [Parameter]
+    public EventCallback GoFirstPage { get; set; }
+
+    [Parameter]
+    public EventCallback GoPreviousPage { get; set; }
+
+    [Parameter]
+    public EventCallback GoNextPage { get; set; }
+
+    [Parameter]
+    public EventCallback GoLastPage { get; set; }
+
+    [Parameter]
+    public EventCallback<int> GoToPage { get; set; }
+
+    [Parameter]
+    public EventCallback ZoomOut { get; set; }
+
+    [Parameter]
+    public EventCallback ZoomIn { get; set; }
+
+    [Parameter]
+    public EventCallback<int> SetZoomPercent { get; set; }
+
+    [Parameter]
+    public bool CanDownloadPdf { get; set; }
+
+    [Parameter]
+    public bool CanPrintPdf { get; set; }
+
+    [Parameter]
+    public bool IsDownloading { get; set; }
+
+    [Parameter]
+    public bool IsPrinting { get; set; }
+
+    [Parameter]
+    public EventCallback DownloadPdf { get; set; }
+
+    [Parameter]
+    public EventCallback PrintPdf { get; set; }
+
+    private int CurrentPageDisplay => CurrentPage > 0 ? CurrentPage : 0;
+    private int TotalPagesDisplay => TotalPages > 0 ? TotalPages : 0;
+    private int ZoomPercentDisplay => ZoomPercent > 0 ? ZoomPercent : 100;
+    private bool CanGoPrevious => CurrentPageDisplay > 1;
+    private bool CanGoNext => TotalPagesDisplay > 0 && CurrentPageDisplay < TotalPagesDisplay;
+    private bool CanZoomOut => ZoomPercentDisplay > MinZoomPercent;
+    private bool CanZoomIn => ZoomPercentDisplay < MaxZoomPercent;
+
+    private async Task GoToFirstAsync()
+    {
+        if (GoFirstPage.HasDelegate)
+            await GoFirstPage.InvokeAsync();
+    }
+
+    private async Task GoToPreviousAsync()
+    {
+        if (GoPreviousPage.HasDelegate)
+            await GoPreviousPage.InvokeAsync();
+    }
+
+    private async Task GoToNextAsync()
+    {
+        if (GoNextPage.HasDelegate)
+            await GoNextPage.InvokeAsync();
+    }
+
+    private async Task GoToLastAsync()
+    {
+        if (GoLastPage.HasDelegate)
+            await GoLastPage.InvokeAsync();
+    }
+
+    private async Task OnPageInputChangedAsync(ChangeEventArgs args)
+    {
+        if (!GoToPage.HasDelegate)
+            return;
+
+        if (!int.TryParse(args.Value?.ToString(), out var page))
+            return;
+
+        page = Math.Max(1, Math.Min(page, Math.Max(1, TotalPagesDisplay)));
+        await GoToPage.InvokeAsync(page);
+    }
+
+    private async Task OnPageSelectChangedAsync(ChangeEventArgs args)
+    {
+        if (!GoToPage.HasDelegate)
+            return;
+
+        if (!int.TryParse(args.Value?.ToString(), out var page))
+            return;
+
+        page = Math.Max(1, Math.Min(page, Math.Max(1, TotalPagesDisplay)));
+        await GoToPage.InvokeAsync(page);
+    }
+
+    private async Task ZoomOutAsync()
+    {
+        if (ZoomOut.HasDelegate)
+            await ZoomOut.InvokeAsync();
+    }
+
+    private async Task ZoomInAsync()
+    {
+        if (ZoomIn.HasDelegate)
+            await ZoomIn.InvokeAsync();
+    }
+
+    private async Task OnZoomSliderInputAsync(ChangeEventArgs args)
+    {
+        if (!SetZoomPercent.HasDelegate)
+            return;
+
+        if (!int.TryParse(args.Value?.ToString(), out var zoomPercent))
+            return;
+
+        zoomPercent = Math.Max(MinZoomPercent, Math.Min(zoomPercent, MaxZoomPercent));
+        await SetZoomPercent.InvokeAsync(zoomPercent);
+    }
+
+    private async Task DownloadPdfAsync()
+    {
+        if (DownloadPdf.HasDelegate)
+            await DownloadPdf.InvokeAsync();
+    }
+
+    private async Task PrintPdfAsync()
+    {
+        if (PrintPdf.HasDelegate)
+            await PrintPdf.InvokeAsync();
+    }
+}

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Components/Sender/CreateEnvelopeWizardResult.cs

@@ -0,0 +1,24 @@
+using EnvelopeGenerator.Domain.Constants;
+
+namespace EnvelopeGenerator.Server.Client.Components.Sender;
+
+public sealed record CreateEnvelopeWizardResult(
+    string Title,
+    string Message,
+    int? EnvelopeTypeId,
+    string Language,
+    bool UseAccessCode,
+    bool TFAEnabled,
+    CertificationType CertificationType,
+    int FinalEmailToCreator,
+    int FinalEmailToReceivers,
+    bool SendReminderEmails,
+    int FirstReminderDays,
+    int ReminderIntervalDays,
+    int ExpiresWhenDays,
+    int ExpiresWarningWhenDays,
+    IReadOnlyList<CreateEnvelopeWizardReceiver> Receivers,
+    byte[]? DocumentBytes,
+    string? DocumentFileName);
+
+public sealed record CreateEnvelopeWizardReceiver(string FullName, string EmailAddress);

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Components/Sender/PdfFileDropZone.razor

@@ -0,0 +1,104 @@
+@using Microsoft.AspNetCore.Components.Forms
+
+<div class="sender-pdf-dropzone @DropZoneClass">
+    <div class="sender-pdf-dropzone__content">
+        <div class="sender-pdf-dropzone__title">@CurrentActionText</div>
+        @if (!string.IsNullOrWhiteSpace(DragDropHintText))
+        {
+            <div class="sender-pdf-dropzone__hint">@DragDropHintText</div>
+        }
+    </div>
+
+    <InputFile OnChange="OnFileSelectedAsync"
+               accept="@Accept"
+               disabled="@Disabled"
+               @ondragenter="OnDragEnter"
+               @ondragleave="OnDragLeave"
+               @ondragover="OnDragOver"
+               @ondrop="OnDrop"
+               class="sender-pdf-dropzone__input" />
+</div>
+
+@code {
+    [Parameter]
+    public bool Disabled { get; set; }
+
+    [Parameter]
+    public bool HasDocument { get; set; }
+
+    [Parameter]
+    public string Accept { get; set; } = ".pdf";
+
+    [Parameter]
+    public string UploadText { get; set; } = "PDF hochladen";
+
+    [Parameter]
+    public string ReplaceText { get; set; } = "PDF ersetzen";
+
+    [Parameter]
+    public string DragDropHintText { get; set; } = "Datei hierhin ziehen oder klicken";
+
+    [Parameter]
+    public EventCallback<InputFileChangeEventArgs> FileSelected { get; set; }
+
+    private int _dragDepth;
+    private bool _isDragActive;
+
+    private string CurrentActionText => HasDocument ? ReplaceText : UploadText;
+
+    private string DropZoneClass
+    {
+        get
+        {
+            if (Disabled)
+                return "sender-pdf-dropzone--disabled";
+
+            return _isDragActive ? "sender-pdf-dropzone--drag-active" : string.Empty;
+        }
+    }
+
+    private void OnDragEnter(DragEventArgs _)
+    {
+        if (Disabled)
+            return;
+
+        _dragDepth++;
+        _isDragActive = true;
+    }
+
+    private void OnDragLeave(DragEventArgs _)
+    {
+        if (Disabled)
+            return;
+
+        _dragDepth = Math.Max(0, _dragDepth - 1);
+        if (_dragDepth == 0)
+            _isDragActive = false;
+    }
+
+    private void OnDragOver(DragEventArgs _)
+    {
+        if (Disabled)
+            return;
+
+        _isDragActive = true;
+    }
+
+    private void OnDrop(DragEventArgs _)
+    {
+        _dragDepth = 0;
+        _isDragActive = false;
+    }
+
+    private async Task OnFileSelectedAsync(InputFileChangeEventArgs args)
+    {
+        _dragDepth = 0;
+        _isDragActive = false;
+
+        if (Disabled)
+            return;
+
+        if (FileSelected.HasDelegate)
+            await FileSelected.InvokeAsync(args);
+    }
+}

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Components/Sender/ReceiverSuggestionFilter/ReceiverFilterCriteria.cs

@@ -0,0 +1,25 @@
+namespace EnvelopeGenerator.Server.Client.Components.Sender.ReceiverSuggestionFilter;
+
+public readonly record struct ReceiverFilterCriteria
+{
+    public readonly string FullName;
+    public readonly string EmailAddress;
+
+    public ReceiverFilterCriteria(string? fullName = "", string? emailAddress = "")
+    {
+        FullName = Normalize(fullName);
+        EmailAddress = Normalize(emailAddress);
+    }
+
+    public readonly bool Matches(ReceiverFilterCriteria criteria)
+        => FullName.Contains(criteria.FullName, StringComparison.Ordinal)
+           && EmailAddress.Contains(criteria.EmailAddress, StringComparison.Ordinal);
+
+    private static string Normalize(string? text)
+    {
+        if (string.IsNullOrWhiteSpace(text))
+            return string.Empty;
+
+        return string.Concat(text.Where(c => !char.IsWhiteSpace(c))).ToLowerInvariant();
+    }
+}