Funktion zur Behebung der Rotation - Class EnvelopeEditorController, Class FixPageRotation

- Einführung der neuen Projekte "Infrastruktur" und "Präsentation" mit ihren jeweiligen GUIDs.
- Die Projektkonfiguration wurde aktualisiert und enthält nun eine „Release“-Einstellung für das angegebene Projekt.
- Angepasste verschachtelte Projektbeziehungen, um die neuen Projekte einzubeziehen.

.gitignore

@@ -360,4 +360,8 @@ MigrationBackup/
 .ionide/
 
 # Fody - auto-generated XML schema
-FodyWeavers.xsd
+FodyWeavers.xsd
+/EnvelopeGenerator.Web/.config/dotnet-tools.json
+/EnvelopeGenerator.GeneratorAPI/ClientApp/envelope-generator-ui/.vscode
+/EnvelopeGenerator.Tests.Application/Services/BugFixTests.cs
+/EnvelopeGenerator.Tests.Application/annotations.json

EnvelopeGenerator.Application/Configurations/AuthenticatorParams.cs

@@ -0,0 +1,19 @@
+namespace EnvelopeGenerator.Application.Configurations
+{
+    public class AuthenticatorParams
+    {
+        public string CharPool { get; init; } = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890123456789012345678901234567890123456789";
+
+        //TODO: Increase the DefaultTotpSecretKeyLength (e.g. to 32) but make sure that the QR code is generated correctly and can be scanned by the authenticator.
+        public int DefaultTotpSecretKeyLength { get; init; } = 20;
+
+        public string TotpIssuer { get; init; } = "signFlow";
+
+        /// <summary>
+        /// 0 is user email, 1 is secret key and 2 is issuer.
+        /// </summary>
+        public string TotpUrlFormat { get; init; } = "otpauth://totp/{0}?secret={1}&issuer={2}";
+
+        public int TotpQRPixelsPerModule { get; init; } = 20;
+    }
+}

EnvelopeGenerator.Application/Configurations/DbTriggerParams.cs

@@ -0,0 +1,5 @@
+namespace EnvelopeGenerator.Application.Configurations;
+
+public class DbTriggerParams : Dictionary<string, IEnumerable<string>>
+{
+}

EnvelopeGenerator.Application/Configurations/DispatcherParams.cs

@@ -0,0 +1,12 @@
+namespace EnvelopeGenerator.Application.Configurations;
+
+public class DispatcherParams
+{
+    public int SendingProfile { get; init; } = 1;
+
+    public string AddedWho { get; init; } = "DDEnvelopGenerator";
+
+    public int ReminderTypeId { get; init; } = 202377;
+
+    public string EmailAttmt1 { get; init; } = string.Empty;
+}

EnvelopeGenerator.Application/Configurations/GtxMessagingParams.cs

@@ -0,0 +1,20 @@
+using DigitalData.Core.Abstractions.Client;
+namespace EnvelopeGenerator.Application.Configurations;
+
+/// <summary>
+/// https://www.gtx-messaging.com/en/api-docs/sms-rest-api/
+/// </summary>
+public class GtxMessagingParams : IHttpClientOptions
+{
+    public required string Uri { get; init; }
+
+    public string? Path { get; init; }
+
+    public Dictionary<string, object>? Headers { get; init; }
+
+    public Dictionary<string, object?>? QueryParams { get; init; }
+
+    public string RecipientQueryParamName { get; init; } = "to";
+
+    public string MessageQueryParamName { get; init; } = "text";
+}

EnvelopeGenerator.Application/Configurations/MailParams.cs

@@ -0,0 +1,6 @@
+namespace EnvelopeGenerator.Application.Configurations;
+
+public class MailParams
+{
+    public required Dictionary<string, string> Placeholders { get; init; }
+}

EnvelopeGenerator.Application/Configurations/TotpSmsParams.cs

@@ -0,0 +1,49 @@
+using OtpNet;
+using System.Globalization;
+
+namespace EnvelopeGenerator.Application.Configurations
+{
+    public class TotpSmsParams
+    {
+        /// <summary>
+        /// The unit is second.
+        /// </summary>
+        public int TotpStep { get; init; } = 90;
+
+        public string Format { get; init; } = "Ihr 2FA-Passwort lautet {0}. Gültig bis {1}";
+        
+        public ExpirationHandler Expiration { get; init; } = new();
+
+        public VerificationWindow? TotpVerificationWindow { get; private init; } = VerificationWindow.RfcSpecifiedNetworkDelay;
+
+        private IEnumerable<int>? _tvwParams;
+
+        public IEnumerable<int>? TotpVerificationWindowParams
+        {
+            get => _tvwParams;
+            init
+            {
+                _tvwParams = value;
+                if(_tvwParams is not null)
+                    TotpVerificationWindow = new(previous: _tvwParams.ElementAtOrDefault(0), future: _tvwParams.ElementAtOrDefault(0));
+            }
+        }
+
+        public class ExpirationHandler
+        {
+            public string CacheKeyFormat { get; init; } = "e{0}_r{1}_sms_code_expiration";
+
+            public string Format { get; init; } = "HH:mm:ss";
+
+            public string CultureName
+            {
+                get => _cultureInfo.Name;
+                init => _cultureInfo = new(value);
+            }
+
+            private CultureInfo _cultureInfo = new("de-DE");
+
+            public CultureInfo CultureInfo => _cultureInfo;
+        }
+    }
+}

EnvelopeGenerator.Application/Contracts/Repositories/IConfigRepository.cs

@@ -0,0 +1,9 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IConfigRepository : ICRUDRepository<Config, int>
+{
+    Task<Config?> ReadFirstAsync();
+}

EnvelopeGenerator.Application/Contracts/Repositories/IDocumentReceiverElementRepository.cs

@@ -0,0 +1,8 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IDocumentReceiverElementRepository : ICRUDRepository<DocumentReceiverElement, int>
+{
+}

EnvelopeGenerator.Application/Contracts/Repositories/IDocumentStatusRepository.cs

@@ -0,0 +1,8 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IDocumentStatusRepository : ICRUDRepository<DocumentStatus, int>
+{
+}

EnvelopeGenerator.Application/Contracts/Repositories/IEmailTemplateRepository.cs

@@ -0,0 +1,10 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+using static EnvelopeGenerator.Common.Constants;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IEmailTemplateRepository : ICRUDRepository<EmailTemplate, int>
+{
+    Task<EmailTemplate?> ReadByNameAsync(EmailTemplateType type);
+}

EnvelopeGenerator.Application/Contracts/Repositories/IEnvelopeCertificateRepository.cs

@@ -0,0 +1,8 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IEnvelopeCertificateRepository : ICRUDRepository<EnvelopeCertificate, int>
+{
+}

EnvelopeGenerator.Application/Contracts/Repositories/IEnvelopeDocumentRepository.cs

@@ -0,0 +1,8 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IEnvelopeDocumentRepository : ICRUDRepository<EnvelopeDocument, int>
+{
+}

EnvelopeGenerator.Application/Contracts/Repositories/IEnvelopeHistoryRepository.cs

@@ -0,0 +1,11 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IEnvelopeHistoryRepository : ICRUDRepository<EnvelopeHistory, long>
+{
+    Task<int> CountAsync(int? envelopeId = null, string? userReference = null, int? status = null);
+
+    Task<IEnumerable<EnvelopeHistory>> ReadAsync(int? envelopeId = null, string? userReference = null, int? status = null, bool withSender = false, bool withReceiver = false);
+}

EnvelopeGenerator.Application/Contracts/Repositories/IEnvelopeReceiverReadOnlyRepository.cs

@@ -0,0 +1,8 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IEnvelopeReceiverReadOnlyRepository : ICRUDRepository<EnvelopeReceiverReadOnly, long>
+{
+}

EnvelopeGenerator.Application/Contracts/Repositories/IEnvelopeReceiverRepository.cs

@@ -0,0 +1,25 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IEnvelopeReceiverRepository : ICRUDRepository<EnvelopeReceiver, (int Envelope, int Receiver)>
+{
+    Task<IEnumerable<EnvelopeReceiver>> ReadByUuidAsync(string uuid, bool withEnvelope = true, bool withReceiver = false, bool readOnly = true);
+
+    Task<IEnumerable<EnvelopeReceiver>> ReadBySignatureAsync(string signature, bool withEnvelope = false, bool withReceiver = true, bool readOnly = true);
+
+    Task<EnvelopeReceiver?> ReadByUuidSignatureAsync(string uuid, string signature, bool withEnvelope = true, bool withReceiver = true, bool readOnly = true);
+
+    Task<string?> ReadAccessCodeAsync(string uuid, string signature, bool readOnly = true);
+
+    Task<int> CountAsync(string uuid, string signature);
+
+    Task<EnvelopeReceiver?> ReadByIdAsync(int envelopeId, int receiverId, bool readOnly = true);
+
+    Task<string?> ReadAccessCodeByIdAsync(int envelopeId, int receiverId, bool readOnly = true);
+
+    Task<IEnumerable<EnvelopeReceiver>> ReadByUsernameAsync(string username, int? min_status = null, int? max_status = null, params int[] ignore_statuses);
+
+    Task<EnvelopeReceiver?> ReadLastByReceiver(string email);
+}

EnvelopeGenerator.Application/Contracts/Repositories/IEnvelopeRepository.cs

@@ -0,0 +1,13 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IEnvelopeRepository : ICRUDRepository<Envelope, int>
+{
+    Task<IEnumerable<Envelope>> ReadAllWithAsync(bool documents = false, bool history = false, bool documentReceiverElement = false);
+
+    Task<Envelope?> ReadByUuidAsync(string uuid, bool withDocuments = false, bool withHistory = false, bool withDocumentReceiverElement = false, bool withUser = false, bool withAll = false);
+
+    Task<IEnumerable<Envelope>> ReadByUserAsync(int userId, int? min_status = null, int? max_status = null, params int[] ignore_statuses);
+}

EnvelopeGenerator.Application/Contracts/Repositories/IEnvelopeTypeRepository.cs

@@ -0,0 +1,8 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IEnvelopeTypeRepository : ICRUDRepository<EnvelopeType, int>
+{
+}

EnvelopeGenerator.Application/Contracts/Repositories/IReceiverRepository.cs

@@ -0,0 +1,9 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IReceiverRepository : ICRUDRepository<Receiver, int>
+{
+    Task<Receiver?> ReadByAsync(string? emailAddress = null, string? signature = null);
+}

EnvelopeGenerator.Application/Contracts/Repositories/IUserReceiverRepository.cs

@@ -0,0 +1,8 @@
+using DigitalData.Core.Abstractions.Infrastructure;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Repositories;
+
+public interface IUserReceiverRepository : ICRUDRepository<UserReceiver, int>
+{
+}

EnvelopeGenerator.Application/Contracts/Services/IAuthenticator.cs

@@ -0,0 +1,18 @@
+using OtpNet;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IAuthenticator
+{
+    string GenerateCode(int length);
+
+    string GenerateTotpSecretKey(int? length = null);
+
+    byte[] GenerateTotpQrCode(string userEmail, string secretKey, string? issuer = null, string? totpUrlFormat = null, int? pixelsPerModule = null);
+
+    byte[] GenerateTotpQrCode(string userEmail, int? length = null, string? issuer = null, string? totpUrlFormat = null, int? pixelsPerModule = null);
+
+    string GenerateTotp(string secretKey, int step = 30);
+
+    bool VerifyTotp(string totpCode, string secretKey, int step = 30, VerificationWindow? window = null);
+}

EnvelopeGenerator.Application/Contracts/Services/IConfigService.cs

@@ -0,0 +1,16 @@
+using DigitalData.Core.Abstractions.Application;
+using DigitalData.Core.DTO;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IConfigService : IReadService<ConfigDto, Config, int>
+{
+    Task<DataResult<ConfigDto>> ReadFirstAsync();
+
+    Task<ConfigDto> ReadDefaultAsync();
+
+    Task<string> ReadDefaultSignatureHost();
+
+}

EnvelopeGenerator.Application/Contracts/Services/IDocumentReceiverElementService.cs

@@ -0,0 +1,9 @@
+using DigitalData.Core.Abstractions.Application;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IDocumentReceiverElementService : IBasicCRUDService<DocumentReceiverElementDto, DocumentReceiverElement, int>
+{
+}

EnvelopeGenerator.Application/Contracts/Services/IDocumentStatusService.cs

@@ -0,0 +1,8 @@
+using DigitalData.Core.Abstractions.Application;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IDocumentStatusService : IBasicCRUDService<DocumentStatusDto, DocumentStatus, int>
+{
+}

EnvelopeGenerator.Application/Contracts/Services/IEmailTemplateService.cs

@@ -0,0 +1,12 @@
+using DigitalData.Core.Abstractions.Application;
+using DigitalData.Core.DTO;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+using static EnvelopeGenerator.Common.Constants;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IEmailTemplateService : IBasicCRUDService<EmailTemplateDto, EmailTemplate, int>
+{
+    Task<DataResult<EmailTemplateDto>> ReadByNameAsync(EmailTemplateType type);
+}

EnvelopeGenerator.Application/Contracts/Services/IEnvelopeCertificateService.cs

@@ -0,0 +1,9 @@
+using DigitalData.Core.Abstractions.Application;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IEnvelopeCertificateService : IBasicCRUDService<EnvelopeCertificateDto, EnvelopeCertificate, int>
+{
+}

EnvelopeGenerator.Application/Contracts/Services/IEnvelopeDocumentService.cs

@@ -0,0 +1,9 @@
+using DigitalData.Core.Abstractions.Application;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IEnvelopeDocumentService : IBasicCRUDService<EnvelopeDocumentDto, EnvelopeDocument, int>
+{
+}

EnvelopeGenerator.Application/Contracts/Services/IEnvelopeHistoryService.cs

@@ -0,0 +1,27 @@
+using DigitalData.Core.Abstractions.Application;
+using DigitalData.Core.DTO;
+using EnvelopeGenerator.Application.DTOs.EnvelopeHistory;
+using EnvelopeGenerator.Application.DTOs.Receiver;
+using EnvelopeGenerator.Domain.Entities;
+using static EnvelopeGenerator.Common.Constants;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IEnvelopeHistoryService : ICRUDService<EnvelopeHistoryCreateDto, EnvelopeHistoryDto, EnvelopeHistoryDto, EnvelopeHistory, long>
+{
+    Task<int> CountAsync(int? envelopeId = null, string? userReference = null, int? status = null);
+
+    Task<bool> AccessCodeAlreadyRequested(int envelopeId, string userReference);
+
+    Task<bool> IsSigned(int envelopeId, string userReference);
+
+    Task<bool> IsRejected(int envelopeId, string? userReference = null);
+
+    Task<IEnumerable<EnvelopeHistoryDto>> ReadAsync(int? envelopeId = null, string? userReference = null, ReferenceType? referenceType = null, int? status = null, bool withSender = false, bool withReceiver = false);
+
+    Task<IEnumerable<EnvelopeHistoryDto>> ReadRejectedAsync(int envelopeId, string? userReference = null);
+
+    Task<IEnumerable<ReceiverReadDto>> ReadRejectingReceivers(int envelopeId);
+
+    Task<DataResult<long>> RecordAsync(int envelopeId, string userReference, EnvelopeStatus status, string? comment = null);
+}

EnvelopeGenerator.Application/Contracts/Services/IEnvelopeMailService.cs

@@ -0,0 +1,18 @@
+using DigitalData.Core.DTO;
+using DigitalData.EmailProfilerDispatcher.Abstraction.Contracts;
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiver;
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiverReadOnly;
+using EnvelopeGenerator.Common;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IEnvelopeMailService : IEmailOutService
+{
+    Task<DataResult<int>> SendAsync(EnvelopeReceiverDto envelopeReceiverDto, Constants.EmailTemplateType tempType, Dictionary<string, object>? optionalPlaceholders = null);
+
+    Task<DataResult<int>> SendAsync(EnvelopeReceiverReadOnlyDto dto, Dictionary<string, object>? optionalPlaceholders = null);
+
+    Task<DataResult<int>> SendAccessCodeAsync(EnvelopeReceiverDto envelopeReceiverDto);
+
+    Task<DataResult<int>> SendTFAQrCodeAsync(EnvelopeReceiverDto envelopeReceiverDto);
+}

EnvelopeGenerator.Application/Contracts/Services/IEnvelopeReceiverReadOnlyService.cs

@@ -0,0 +1,9 @@
+using DigitalData.Core.Abstractions.Application;
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiverReadOnly;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IEnvelopeReceiverReadOnlyService : ICRUDService<EnvelopeReceiverReadOnlyCreateDto, EnvelopeReceiverReadOnlyDto, EnvelopeReceiverReadOnlyUpdateDto, EnvelopeReceiverReadOnly, long>
+{
+}

EnvelopeGenerator.Application/Contracts/Services/IEnvelopeReceiverService.cs

@@ -0,0 +1,38 @@
+using DigitalData.Core.Abstractions.Application;
+using DigitalData.Core.DTO;
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiver;
+using EnvelopeGenerator.Application.DTOs.Messaging;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IEnvelopeReceiverService : IBasicCRUDService<EnvelopeReceiverDto, EnvelopeReceiver, (int Envelope, int Receiver)>
+{
+
+    Task<DataResult<IEnumerable<EnvelopeReceiverDto>>> ReadByUuidAsync(string uuid, bool withEnvelope = true, bool withReceiver = false, bool readOnly = true);
+
+    Task<DataResult<IEnumerable<string?>>> ReadAccessCodeByUuidAsync(string uuid, bool withEnvelope = false, bool withReceiver = true);
+
+    Task<DataResult<IEnumerable<EnvelopeReceiverDto>>> ReadBySignatureAsync(string signature, bool withEnvelope = false, bool withReceiver = true, bool readOnly = true);
+
+    Task<DataResult<EnvelopeReceiverDto>> ReadByUuidSignatureAsync(string uuid, string signature, bool withEnvelope = true, bool withReceiver = true, bool readOnly = true);
+
+    Task<DataResult<EnvelopeReceiverSecretDto>> ReadWithSecretByUuidSignatureAsync(string uuid, string signature, bool withEnvelope = true, bool withReceiver = true, bool readOnly = true);
+
+    Task<DataResult<EnvelopeReceiverDto>> ReadByEnvelopeReceiverIdAsync(string envelopeReceiverId, bool withEnvelope = true, bool withReceiver = true, bool readOnly = true);
+
+    Task<DataResult<string>> ReadAccessCodeByIdAsync(int envelopeId, int receiverId);
+
+    Task<DataResult<bool>> VerifyAccessCodeAsync(string uuid, string signature, string accessCode);
+
+    Task<DataResult<bool>> VerifyAccessCodeAsync(string envelopeReceiverId, string accessCode);
+
+    Task<DataResult<bool>> IsExisting(string envelopeReceiverId);
+
+    Task<DataResult<IEnumerable<EnvelopeReceiverDto>>> ReadByUsernameAsync(string username, int? min_status = null, int? max_status = null, params int[] ignore_statuses);
+
+    Task<DataResult<string?>> ReadLastUsedReceiverNameByMail(string mail);
+
+    Task<DataResult<SmsResponse>> SendSmsAsync(string envelopeReceiverId, string message);
+    Task<DataResult<IEnumerable<EnvelopeReceiverSecretDto>>> ReadWithSecretByUuidAsync(string uuid);
+}

EnvelopeGenerator.Application/Contracts/Services/IEnvelopeService.cs

@@ -0,0 +1,15 @@
+using DigitalData.Core.Abstractions.Application;
+using DigitalData.Core.DTO;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IEnvelopeService : IBasicCRUDService<EnvelopeDto, Envelope, int>
+{
+    Task<DataResult<IEnumerable<EnvelopeDto>>> ReadAllWithAsync(bool documents = false, bool history = false, bool documentReceiverElement = false);
+
+    Task<DataResult<EnvelopeDto>> ReadByUuidAsync(string uuid, bool withDocuments = false, bool withHistory = false, bool withDocumentReceiverElement = false, bool withUser = false, bool withAll = false);
+
+    Task<DataResult<IEnumerable<EnvelopeDto>>> ReadByUserAsync(int userId, int? min_status = null, int? max_status = null, params int[] ignore_statuses);
+}

EnvelopeGenerator.Application/Contracts/Services/IEnvelopeSmsHandler.cs

@@ -0,0 +1,17 @@
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiver;
+using EnvelopeGenerator.Application.DTOs.Messaging;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IEnvelopeSmsHandler
+{
+    /// <summary>
+    /// If expiration is passed then, sends sms and returns smsResponse and up-to-date expiration; otherwise send expiration.
+    /// </summary>
+    /// <param name="er_secret"></param>
+    /// <param name="cToken"></param>
+    /// <returns></returns>
+    Task<(SmsResponse? SmsResponse, DateTime Expiration)> SendTotpAsync(EnvelopeReceiverSecretDto er_secret, CancellationToken cToken = default);
+
+    bool VerifyTotp(string totpCode, string secretKey);
+}

EnvelopeGenerator.Application/Contracts/Services/IEnvelopeTypeService.cs

@@ -0,0 +1,9 @@
+using DigitalData.Core.Abstractions.Application;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IEnvelopeTypeService : IBasicCRUDService<EnvelopeTypeDto, EnvelopeType, int>
+{
+}

EnvelopeGenerator.Application/Contracts/Services/IReceiverService.cs

@@ -0,0 +1,16 @@
+using DigitalData.Core.Abstractions;
+using DigitalData.Core.Abstractions.Application;
+using DigitalData.Core.DTO;
+using EnvelopeGenerator.Application.DTOs.Receiver;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IReceiverService : ICRUDService<ReceiverCreateDto, ReceiverReadDto, ReceiverUpdateDto, Receiver, int>
+{
+    Task<DataResult<ReceiverReadDto>> ReadByAsync(string? emailAddress = null, string? signature = null);
+
+    Task<Result> DeleteByAsync(string? emailAddress = null, string? signature = null);
+
+    Task<Result> UpdateAsync<TUpdateDto>(TUpdateDto updateDto) where TUpdateDto : IUnique<int>;
+}

EnvelopeGenerator.Application/Contracts/Services/ISmsSender.cs

@@ -0,0 +1,11 @@
+using EnvelopeGenerator.Application.DTOs.Messaging;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+//TODO: move to DigitalData.Core
+public interface ISmsSender
+{
+    string ServiceProvider { get; }
+
+    Task<SmsResponse> SendSmsAsync(string recipient, string message);
+}

EnvelopeGenerator.Application/Contracts/Services/IUserReceiverService.cs

@@ -0,0 +1,9 @@
+using DigitalData.Core.Abstractions.Application;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.Contracts.Services;
+
+public interface IUserReceiverService : IBasicCRUDService<UserReceiverDto, UserReceiver, int>
+{
+}

EnvelopeGenerator.Application/DTOs/ConfigDto.cs

@@ -0,0 +1,19 @@
+using DigitalData.Core.Abstractions;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Text.Json.Serialization;
+
+namespace EnvelopeGenerator.Application.DTOs
+{
+    public record ConfigDto(
+        string DocumentPath,
+        int SendingProfile,
+        string SignatureHost,
+        string ExternalProgramName,
+        string ExportPath) : IUnique<int>
+    {
+        [NotMapped]
+        [JsonIgnore]
+        [Obsolete("Configuration does not have an ID; it represents a single table in the database.")]
+        public int Id => throw new InvalidOperationException("This configuration does not support an ID as it represents a single row in the database.");
+    };
+}

EnvelopeGenerator.Application/DTOs/DocumentReceiverElementDto.cs

@@ -0,0 +1,24 @@
+using DigitalData.Core.Abstractions;
+
+namespace EnvelopeGenerator.Application.DTOs
+{
+    public record DocumentReceiverElementDto(
+        int Id,
+        int DocumentId,
+        int ReceiverId,
+        int ElementType,
+        double X,
+        double Y,
+        double Width,
+        double Height,
+        int Page,
+        bool Required,
+        string? Tooltip,
+        bool ReadOnly,
+        int AnnotationIndex,
+        DateTime AddedWhen,
+        DateTime? ChangedWhen,
+        double Top,
+        double Left
+        ): IUnique<int>;
+}

EnvelopeGenerator.Application/DTOs/DocumentStatusDto.cs

@@ -0,0 +1,16 @@
+using DigitalData.Core.Abstractions;
+
+namespace EnvelopeGenerator.Application.DTOs
+{
+    public record DocumentStatusDto(
+        int Id,
+        int EnvelopeId,
+        int ReceiverId,
+        int Status,
+        DateTime? StatusChangedWhen,
+        DateTime AddedWhen,
+        DateTime? ChangedWhen) : IUnique<int>
+    {
+        public string? Value { get; set; }
+    };
+}

EnvelopeGenerator.Application/DTOs/EmailTemplateDto.cs

@@ -0,0 +1,10 @@
+using DigitalData.Core.Abstractions;
+
+namespace EnvelopeGenerator.Application.DTOs
+{
+    public record EmailTemplateDto(
+        int Id,
+        string Name,
+        string Body,
+        string Subject) : IUnique<int>;
+}

EnvelopeGenerator.Application/DTOs/EnvelopeCertificateDto.cs

@@ -0,0 +1,14 @@
+using DigitalData.Core.Abstractions;
+
+namespace EnvelopeGenerator.Application.DTOs
+{
+    public record EnvelopeCertificateDto(
+        int Id,
+        int EnvelopeId,
+        string EnvelopeUuid,
+        string EnvelopeSubject,
+        int CreatorId,
+        string CreatorName,
+        string CreatorEmail,
+        int EnvelopeStatus) : IUnique<int>;
+}

EnvelopeGenerator.Application/DTOs/EnvelopeDocumentDto.cs

@@ -0,0 +1,13 @@
+using DigitalData.Core.Abstractions;
+
+namespace EnvelopeGenerator.Application.DTOs
+{
+    public record EnvelopeDocumentDto
+    (
+        int Id,
+        int EnvelopeId,
+        DateTime AddedWhen,
+        byte[]? ByteData = null,
+        IEnumerable<DocumentReceiverElementDto>? Elements = null
+    ) : IUnique<int>;
+}

EnvelopeGenerator.Application/DTOs/EnvelopeDto.cs

@@ -0,0 +1,69 @@
+using DigitalData.Core.Abstractions;
+using DigitalData.EmailProfilerDispatcher.Abstraction.Attributes;
+using DigitalData.UserManager.Application.DTOs.User;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.DTOs
+{
+    public record EnvelopeDto() : IUnique<int>
+    {
+		public int Id { get; set; }
+
+		public int UserId { get; set; }
+
+		public int Status { get; set; }
+
+		public string StatusName { get; set; }
+
+        public string Uuid { get; set; }
+
+		[TemplatePlaceholder("[MESSAGE]")]
+		public string Message { get; set; }
+		public DateTime? ExpiresWhen { get; set; }
+		public DateTime? ExpiresWarningWhen { get; set; }
+		public DateTime AddedWhen { get; set; }
+		public DateTime? ChangedWhen { get; set; }
+
+		[TemplatePlaceholder("[DOCUMENT_TITLE]")]
+		public string Title { get; set; }
+
+		public int? ContractType { get; set; }
+
+		public string Language { get; set; }
+
+		public bool? SendReminderEmails { get; set; }
+
+		public int? FirstReminderDays { get; set; }
+
+		public int? ReminderIntervalDays { get; set; }
+
+		public int? EnvelopeTypeId { get; set; }
+
+		public int? CertificationType { get; set; }
+
+		public bool? UseAccessCode { get; set; }
+
+		public int? FinalEmailToCreator { get; set; }
+
+		public int? FinalEmailToReceivers { get; set; }
+
+		public int? ExpiresWhenDays { get; set; }
+
+		public int? ExpiresWarningWhenDays { get; set; }
+
+        public bool TFAEnabled { get; init; }
+
+        public bool DmzMoved { get; set; }
+		public UserReadDto? User { get; set; }
+		public EnvelopeType? EnvelopeType { get; set; }
+
+		public string? EnvelopeTypeTitle { get; set; }
+
+		public bool IsAlreadySent { get; set; }
+
+		public string? StatusTranslated { get; set; }
+
+		public string? ContractTypeTranslated { get; set; }
+		public IEnumerable<EnvelopeDocumentDto>? Documents { get; set; }
+	}
+}

EnvelopeGenerator.Application/DTOs/EnvelopeHistory/EnvelopeHistoryCreateDto.cs

@@ -0,0 +1,9 @@
+namespace EnvelopeGenerator.Application.DTOs.EnvelopeHistory
+{
+    public record EnvelopeHistoryCreateDto(
+        int EnvelopeId,
+        string UserReference,
+        int Status,
+        DateTime? ActionDate,
+        string? Comment = null);
+}

EnvelopeGenerator.Application/DTOs/EnvelopeHistory/EnvelopeHistoryDto.cs

@@ -0,0 +1,21 @@
+using DigitalData.Core.Abstractions;
+using DigitalData.Core.DTO;
+using DigitalData.UserManager.Application.DTOs.User;
+using EnvelopeGenerator.Application.DTOs.Receiver;
+using static EnvelopeGenerator.Common.Constants;
+
+namespace EnvelopeGenerator.Application.DTOs.EnvelopeHistory
+{
+    public record EnvelopeHistoryDto(
+        long Id,
+        int EnvelopeId,
+        string UserReference,
+        int Status,
+        string? StatusName,
+        DateTime AddedWhen,
+        DateTime? ActionDate,
+        UserCreateDto? Sender,
+        ReceiverReadDto? Receiver,
+        ReferenceType ReferenceType,
+        string? Comment = null) : BaseDTO<long>(Id), IUnique<long>;
+}

EnvelopeGenerator.Application/DTOs/EnvelopeReceiver/EnvelopeReceiverBasicDto.cs

@@ -0,0 +1,31 @@
+using DigitalData.Core.Abstractions;
+using DigitalData.EmailProfilerDispatcher.Abstraction.Attributes;
+
+namespace EnvelopeGenerator.Application.DTOs.EnvelopeReceiver
+{
+    public record EnvelopeReceiverBasicDto() : IUnique<(int Envelope, int Receiver)>
+    {
+        public (int Envelope, int Receiver) Id => (Envelope: EnvelopeId, Receiver: ReceiverId);
+
+        public int EnvelopeId { get; init; }
+
+        public int ReceiverId { get; init; }
+
+        public int Sequence { get; init; }
+
+        [TemplatePlaceholder("[NAME_RECEIVER]")]
+        public string? Name { get; init; }
+
+        public string? JobTitle { get; init; }
+
+        public string? CompanyName { get; init; }
+
+        public string? PrivateMessage { get; init; }
+
+        public DateTime AddedWhen { get; init; }
+
+        public DateTime? ChangedWhen { get; init; }
+
+        public bool HasPhoneNumber { get; init; }
+    }
+}

EnvelopeGenerator.Application/DTOs/EnvelopeReceiver/EnvelopeReceiverDto.cs

@@ -0,0 +1,11 @@
+using EnvelopeGenerator.Application.DTOs.Receiver;
+
+namespace EnvelopeGenerator.Application.DTOs.EnvelopeReceiver
+{
+    public record EnvelopeReceiverDto() : EnvelopeReceiverBasicDto()
+    {
+        public EnvelopeDto? Envelope { get; set; }
+
+        public ReceiverReadDto? Receiver { get; set; }
+    }
+}

EnvelopeGenerator.Application/DTOs/EnvelopeReceiver/EnvelopeReceiverSecretDto.cs

@@ -0,0 +1,9 @@
+namespace EnvelopeGenerator.Application.DTOs.EnvelopeReceiver
+{
+    public record EnvelopeReceiverSecretDto() : EnvelopeReceiverDto()
+    {
+        public string? AccessCode { get; init; }
+
+        public string? PhoneNumber { get; init; }
+    }
+}

EnvelopeGenerator.Application/DTOs/EnvelopeReceiverReadOnly/EnvelopeReceiverReadOnlyCreateDto.cs

@@ -0,0 +1,22 @@
+using System.ComponentModel.DataAnnotations;
+using System.Text.Json.Serialization;
+
+namespace EnvelopeGenerator.Application.DTOs.EnvelopeReceiverReadOnly
+{
+    public record EnvelopeReceiverReadOnlyCreateDto(
+        DateTime DateValid)
+    {
+        [EmailAddress]
+        [Required]
+        public required string ReceiverMail { get; init; }
+
+        [JsonIgnore]
+        public long? EnvelopeId { get; set; } = null;
+
+        [JsonIgnore]
+        public string? AddedWho { get; set; }
+
+        [JsonIgnore]
+        public DateTime AddedWhen { get; } = DateTime.Now;
+    };
+}

EnvelopeGenerator.Application/DTOs/EnvelopeReceiverReadOnly/EnvelopeReceiverReadOnlyDto.cs

@@ -0,0 +1,16 @@
+using EnvelopeGenerator.Application.DTOs.Receiver;
+
+namespace EnvelopeGenerator.Application.DTOs.EnvelopeReceiverReadOnly
+{
+    public record EnvelopeReceiverReadOnlyDto(
+        long Id,
+        long EnvelopeId,
+        string ReceiverMail,
+        DateTime DateValid,
+        DateTime AddedWhen,
+        string AddedWho,
+        EnvelopeDto? Envelope = null,              
+        string? ChangedWho = null,
+        DateTime? ChangedWhen = null,
+        ReceiverReadDto? Receiver = null);
+}

EnvelopeGenerator.Application/DTOs/EnvelopeReceiverReadOnly/EnvelopeReceiverReadOnlyUpdateDto.cs

@@ -0,0 +1,12 @@
+using DigitalData.Core.Abstractions;
+
+namespace EnvelopeGenerator.Application.DTOs.EnvelopeReceiverReadOnly
+{
+    public record EnvelopeReceiverReadOnlyUpdateDto(
+        long Id,
+        DateTime DateValid,
+        string ChangedWho) : IUnique<long>
+    {
+        public DateTime ChangedWhen { get; } = DateTime.Now;
+    };
+}

EnvelopeGenerator.Application/DTOs/EnvelopeTypeDto.cs

@@ -0,0 +1,21 @@
+using DigitalData.Core.Abstractions;
+
+namespace EnvelopeGenerator.Application.DTOs
+{
+    public record EnvelopeTypeDto(
+        int Id,
+        string Title,
+        string Language,
+        int? ExpiresDays,
+        int? CertificationType,
+        bool? UseAccessCode,
+        int? FinalEmailToCreator,
+        int? FinalEmailToReceivers,
+        DateTime AddedWhen,
+        DateTime? ChangedWhen,
+        int? ExpiresWarningDays,
+        bool? SendReminderEmails,
+        int? FirstReminderDays,
+        int? ReminderIntervalDays,
+        int? ContractType) : IUnique<int>;
+}

EnvelopeGenerator.Application/DTOs/Messaging/GtxMessagingResponse.cs

@@ -0,0 +1,4 @@
+namespace EnvelopeGenerator.Application.DTOs.Messaging
+{
+    public class GtxMessagingResponse : Dictionary<string, object?> { }
+}

EnvelopeGenerator.Application/DTOs/Messaging/SmsResponse.cs

@@ -0,0 +1,11 @@
+namespace EnvelopeGenerator.Application.DTOs.Messaging
+{
+    public record SmsResponse
+    {
+        public required bool Ok { get; init; }
+
+        public bool Failed => !Ok;
+
+        public dynamic? Errors { get; init; }
+    }
+}

EnvelopeGenerator.Application/DTOs/Receiver/ReceiverCreateDto.cs

@@ -0,0 +1,21 @@
+using System.ComponentModel.DataAnnotations;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace EnvelopeGenerator.Application.DTOs.Receiver
+{
+    public record ReceiverCreateDto([EmailAddress] string EmailAddress, string? TotpSecretkey = null)
+    {
+        public string Signature => sha256HexOfMail.Value;
+
+        private readonly Lazy<string> sha256HexOfMail = new(() =>
+        {
+            var bytes_arr = Encoding.UTF8.GetBytes(EmailAddress.ToUpper());
+            var hash_arr = SHA256.HashData(bytes_arr);
+            var hexa_str = BitConverter.ToString(hash_arr);
+            return hexa_str.Replace("-", string.Empty);
+        });
+
+        public DateTime AddedWhen { get; } = DateTime.Now;
+    };
+}

EnvelopeGenerator.Application/DTOs/Receiver/ReceiverReadDto.cs

@@ -0,0 +1,24 @@
+using DigitalData.Core.Abstractions;
+using DigitalData.Core.DTO;
+using DigitalData.EmailProfilerDispatcher.Abstraction.Attributes;
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiver;
+using System.Text.Json.Serialization;
+
+namespace EnvelopeGenerator.Application.DTOs.Receiver;
+
+public record ReceiverReadDto(
+    int Id,
+    string EmailAddress,
+    string Signature,
+    DateTime AddedWhen
+    ) : BaseDTO<int>(Id), IUnique<int>
+{
+    [JsonIgnore]
+    public IEnumerable<EnvelopeReceiverBasicDto>? EnvelopeReceivers { get; init; }
+
+    public string? LastUsedName => EnvelopeReceivers?.LastOrDefault()?.Name;
+
+    public string? TotpSecretkey { get; set; } = null;
+
+    public DateTime? TfaRegDeadline { get; set; }
+};

EnvelopeGenerator.Application/DTOs/Receiver/ReceiverUpdateDto.cs

@@ -0,0 +1,5 @@
+using DigitalData.Core.Abstractions;
+
+namespace EnvelopeGenerator.Application.DTOs.Receiver;
+
+public record ReceiverUpdateDto(int Id, string? TotpSecretkey = null, DateTime? TfaRegDeadline = null) : IUnique<int>;

EnvelopeGenerator.Application/DTOs/UserReceiverDto.cs

@@ -0,0 +1,13 @@
+using DigitalData.Core.Abstractions;
+
+namespace EnvelopeGenerator.Application.DTOs
+{
+    public record UserReceiverDto(
+        int Id,
+        int UserId,
+        int ReceiverId,
+        string Name,
+        string CompanyName,
+        string JobTitle,
+        DateTime AddedWhen) : IUnique<int>;
+}

EnvelopeGenerator.Application/EnvelopeFlag.cs

@@ -0,0 +1,10 @@
+namespace EnvelopeGenerator.Application
+{
+    public enum EnvelopeFlag
+    {
+        EnvelopeOrReceiverNonexists,
+        NonDecodableEnvelopeReceiverId,
+        WrongEnvelopeReceiverId,
+        AccessCodeNull
+    }
+}

EnvelopeGenerator.Application/EnvelopeGenerator.Application.csproj

@@ -0,0 +1,60 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<TargetFramework>net7.0</TargetFramework>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<Nullable>enable</Nullable>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<None Remove="Resources\Model.Designer.vb" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<PackageReference Include="AutoMapper" Version="13.0.1" />
+		<PackageReference Include="DigitalData.Core.Abstractions" Version="2.2.1" />
+		<PackageReference Include="DigitalData.Core.Application" Version="2.0.0" />
+		<PackageReference Include="DigitalData.Core.Client" Version="2.0.3" />
+		<PackageReference Include="DigitalData.Core.DTO" Version="2.0.0" />
+		<PackageReference Include="DigitalData.EmailProfilerDispatcher" Version="2.0.0" />
+		<PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="7.0.18" />
+		<PackageReference Include="Otp.NET" Version="1.4.0" />
+		<PackageReference Include="QRCoder" Version="1.6.0" />
+		<PackageReference Include="QRCoder-ImageSharp" Version="0.10.0" />
+		<PackageReference Include="UserManager.Application" Version="2.0.0" />
+		<PackageReference Include="UserManager.Infrastructure" Version="2.0.0" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<ProjectReference Include="..\EnvelopeGenerator.Domain\EnvelopeGenerator.Domain.csproj" />
+		<ProjectReference Include="..\EnvelopeGenerator.Extensions\EnvelopeGenerator.Extensions.csproj" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<Compile Update="Resources\Model.Designer.cs">
+			<DesignTime>True</DesignTime>
+			<AutoGen>True</AutoGen>
+			<DependentUpon>Model.resx</DependentUpon>
+		</Compile>
+	</ItemGroup>
+
+	<ItemGroup>
+		<EmbeddedResource Update="Resources\Model.en.resx">
+			<CustomToolNamespace>My.Resources</CustomToolNamespace>
+			<LastGenOutput>Model.en.Designer.vb</LastGenOutput>
+			<Generator>PublicResXFileCodeGenerator</Generator>
+		</EmbeddedResource>
+		<EmbeddedResource Update="Resources\Model.resx">
+			<CustomToolNamespace>My.Resources</CustomToolNamespace>
+			<LastGenOutput>Model.Designer.cs</LastGenOutput>
+			<Generator>PublicResXFileCodeGenerator</Generator>
+		</EmbeddedResource>
+		<EmbeddedResource Update="Resources\Resource.de-DE.resx">
+			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+		</EmbeddedResource>
+		<EmbeddedResource Update="Resources\Resource.en-US.resx">
+			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+		</EmbeddedResource>
+	</ItemGroup>
+
+</Project>

EnvelopeGenerator.Application/Extensions/CacheExtensions.cs

@@ -0,0 +1,131 @@
+using Microsoft.Extensions.Caching.Distributed;
+
+namespace EnvelopeGenerator.Application.Extensions
+{
+    public static class CacheExtensions
+    {
+        public static Task SetLongAsync(this IDistributedCache cache, string key, long value, DistributedCacheEntryOptions? options = null, CancellationToken cToken = default)
+            => options is null
+                ? cache.SetAsync(key, BitConverter.GetBytes(value), token: cToken)
+                : cache.SetAsync(key, BitConverter.GetBytes(value), options: options, token: cToken);
+
+        public static async Task<long?> GetLongAsync(this IDistributedCache cache, string key, CancellationToken cToken = default)
+        {
+            var value = await cache.GetAsync(key, cToken);
+            return value is null ? null : BitConverter.ToInt64(value, 0);
+        }
+
+        public static Task SetDateTimeAsync(this IDistributedCache cache, string key, DateTime value, DistributedCacheEntryOptions? options = null, CancellationToken cToken = default)
+            => cache.SetLongAsync(key: key, value: value.Ticks, options: options, cToken: cToken);
+
+        public static async Task<DateTime?> GetDateTimeAsync(this IDistributedCache cache, string key, CancellationToken cToken = default)
+        {
+            var value = await cache.GetAsync(key, cToken);
+            return value is null ? null : new(BitConverter.ToInt64(value, 0));
+        }
+
+        public static Task SetTimeSpanAsync(this IDistributedCache cache, string key, TimeSpan value, DistributedCacheEntryOptions? options = null, CancellationToken cToken = default)
+            => cache.SetLongAsync(key: key, value: value.Ticks, options: options, cToken);
+
+        public static async Task<TimeSpan?> GetTimeSpanAsync(this IDistributedCache cache, string key, CancellationToken cToken = default)
+        {
+            var value = await cache.GetAsync(key, cToken);
+            return value is null ? null : new(BitConverter.ToInt64(value, 0));
+        }
+
+        //TODO: use code generator
+        #region GetOrSetAsync
+
+        #region string
+        public static async Task<string> GetOrSetAsync(this IDistributedCache cache, string key, Func<string> factory, DistributedCacheEntryOptions? options = null, bool cacheInBackground = false, CancellationToken cToken = default)
+        {
+            var value = await cache.GetStringAsync(key, cToken);
+            if (value is null)
+            {
+                // create new and save
+                value = factory();
+
+                Task CacheAsync() => options is null
+                        ? cache.SetStringAsync(key, value, cToken)
+                        : cache.SetStringAsync(key, value, options, cToken);
+
+                if (cacheInBackground)
+                    _ = Task.Run(async () => await CacheAsync(), cToken);
+                else
+                    await CacheAsync();
+            }
+
+            return value;
+        }
+
+        public static async Task<string> GetOrSetAsync(this IDistributedCache cache, string key, Func<Task<string>> factoryAsync, DistributedCacheEntryOptions? options = null, bool cacheInBackground = false, CancellationToken cToken = default)
+        {
+            var value = await cache.GetStringAsync(key, cToken);
+            if(value is null)
+            {
+                // create new and save
+                value = await factoryAsync();
+
+                Task CacheAsync() => options is null
+                    ? cache.SetStringAsync(key: key, value: value, token: cToken)
+                    : cache.SetStringAsync(key: key, value: value, options: options, token: cToken);
+
+                if (cacheInBackground)
+                    _ = Task.Run(async () => await CacheAsync(), cToken);
+                else
+                    await CacheAsync();
+            }
+
+            return value;
+        }
+        #endregion
+
+        #region DateTime
+        public static async Task<DateTime> GetOrSetAsync(this IDistributedCache cache, string key, Func<DateTime> factory, DistributedCacheEntryOptions? options = null, bool cacheInBackground = false, CancellationToken cToken = default)
+        {
+            if (await cache.GetDateTimeAsync(key, cToken) is DateTime dateTimeValue)
+                return dateTimeValue;
+            else
+            {
+                // create new and save
+                var newValue = factory();
+
+                Task CacheAsync() => options is null
+                        ? cache.SetDateTimeAsync(key, newValue, cToken: cToken)
+                        : cache.SetDateTimeAsync(key, newValue, options, cToken);
+
+                if (cacheInBackground)
+                    _ = Task.Run(async () => await CacheAsync(), cToken);
+                else
+                    await CacheAsync();
+
+                return newValue;
+            }
+        }
+
+        public static async Task<DateTime> GetOrSetAsync(this IDistributedCache cache, string key, Func<Task<DateTime>> factory, DistributedCacheEntryOptions? options = null, bool cacheInBackground = false, CancellationToken cToken = default)
+        {
+            if (await cache.GetDateTimeAsync(key, cToken) is DateTime dateTimeValue)
+                return dateTimeValue;
+            else
+            {
+                // create new and save
+                var newValue = await factory();
+
+                Task CacheAsync() => options is null
+                        ? cache.SetDateTimeAsync(key, newValue, cToken: cToken)
+                        : cache.SetDateTimeAsync(key, newValue, options, cToken);
+
+                if (cacheInBackground)
+                    _ = Task.Run(async () => await CacheAsync(), cToken);
+                else
+                    await CacheAsync();
+
+                return newValue;
+            }
+        }
+        #endregion
+
+        #endregion
+    }
+}

EnvelopeGenerator.Application/Extensions/DIExtensions.cs

@@ -0,0 +1,52 @@
+using DigitalData.UserManager.Application.MappingProfiles;
+using EnvelopeGenerator.Application.MappingProfiles;
+using EnvelopeGenerator.Application.Configurations;
+using EnvelopeGenerator.Application.Services;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+using DigitalData.Core.Client;
+using QRCoder;
+using EnvelopeGenerator.Application.Contracts.Services;
+
+namespace EnvelopeGenerator.Application.Extensions;
+
+public static class DIExtensions
+{
+    public static IServiceCollection AddEnvelopeGeneratorServices(this IServiceCollection services, IConfiguration config)
+    {
+        //Inject CRUD Service and repositoriesad
+        services.TryAddScoped<IConfigService, ConfigService>();
+        services.TryAddScoped<IDocumentReceiverElementService, DocumentReceiverElementService>();
+        services.TryAddScoped<IEnvelopeDocumentService, EnvelopeDocumentService>();
+        services.TryAddScoped<IEnvelopeHistoryService, EnvelopeHistoryService>();
+        services.TryAddScoped<IDocumentStatusService, DocumentStatusService>();
+        services.TryAddScoped<IEmailTemplateService, EmailTemplateService>();
+        services.TryAddScoped<IEnvelopeService, EnvelopeService>();
+        services.TryAddScoped<IEnvelopeCertificateService, EnvelopeCertificateService>();
+        services.TryAddScoped<IEnvelopeDocumentService, EnvelopeDocumentService>();
+        services.TryAddScoped<IEnvelopeReceiverService, EnvelopeReceiverService>();
+        services.TryAddScoped<IEnvelopeTypeService, EnvelopeTypeService>();
+        services.TryAddScoped<IReceiverService, ReceiverService>();
+        services.TryAddScoped<IUserReceiverService, UserReceiverService>();
+        services.TryAddScoped<IEnvelopeReceiverReadOnlyService, EnvelopeReceiverReadOnlyService>();
+
+        //Auto mapping profiles
+        services.AddAutoMapper(typeof(BasicDtoMappingProfile).Assembly);
+        services.AddAutoMapper(typeof(UserMappingProfile).Assembly);
+
+        services.Configure<DispatcherParams>(config.GetSection(nameof(DispatcherParams)));
+        services.Configure<MailParams>(config.GetSection(nameof(MailParams)));
+        services.Configure<AuthenticatorParams>(config.GetSection(nameof(AuthenticatorParams)));
+        services.Configure<TotpSmsParams>(config.GetSection(nameof(TotpSmsParams)));
+        services.Configure<DbTriggerParams>(config.GetSection(nameof(DbTriggerParams)));
+
+        services.AddHttpClientService<GtxMessagingParams>(config.GetSection(nameof(GtxMessagingParams)));
+        services.TryAddSingleton<ISmsSender, GTXSmsSender>();
+        services.TryAddSingleton<IEnvelopeSmsHandler, EnvelopeSmsHandler>();
+        services.TryAddSingleton<IAuthenticator, Authenticator>();
+        services.TryAddSingleton<QRCodeGenerator>();
+
+        return services;
+    }
+}

EnvelopeGenerator.Application/Extensions/MappingExtensions.cs

@@ -0,0 +1,14 @@
+using EnvelopeGenerator.Application.DTOs.Messaging;
+
+namespace EnvelopeGenerator.Application.Extensions
+{
+    public static class MappingExtensions
+    {
+        public static bool Ok(this GtxMessagingResponse gtxMessagingResponse)
+            => gtxMessagingResponse.TryGetValue("message-status", out var status)
+            && status?.ToString()?.ToLower() == "ok";
+
+        public static string ToBase64String(this byte[] bytes)
+            => Convert.ToBase64String(bytes);
+    }
+}

EnvelopeGenerator.Application/Key.cs

@@ -0,0 +1,20 @@
+namespace EnvelopeGenerator.Application
+{
+    public static class Key
+    {
+        public static readonly string InnerServiceError = nameof(InnerServiceError);
+        public static readonly string EnvelopeNotFound = nameof(EnvelopeNotFound);
+        public static readonly string EnvelopeReceiverNotFound = nameof(EnvelopeReceiverNotFound);
+        public static readonly string AccessCodeNull = nameof(AccessCodeNull);
+        public static readonly string WrongAccessCode = nameof(WrongAccessCode);
+        public static readonly string DataIntegrityIssue = nameof(DataIntegrityIssue);
+        public static readonly string SecurityBreachOrDataIntegrity = nameof(SecurityBreachOrDataIntegrity);
+        public static readonly string PossibleDataIntegrityIssue = nameof(PossibleDataIntegrityIssue);
+        public static readonly string SecurityBreach = nameof(SecurityBreach);
+        public static readonly string PossibleSecurityBreach = nameof(PossibleSecurityBreach);
+        public static readonly string WrongEnvelopeReceiverId = nameof(WrongEnvelopeReceiverId);
+        public static readonly string EnvelopeOrReceiverNonexists = nameof(EnvelopeOrReceiverNonexists);
+        public static readonly string PhoneNumberNonexists = nameof(PhoneNumberNonexists);
+        public static readonly string Default = nameof(Default);
+    }
+}

EnvelopeGenerator.Application/MappingProfiles/BasicDtoMappingProfile.cs

@@ -0,0 +1,64 @@
+using AutoMapper;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Application.DTOs.EnvelopeHistory;
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiver;
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiverReadOnly;
+using EnvelopeGenerator.Application.DTOs.Messaging;
+using EnvelopeGenerator.Application.DTOs.Receiver;
+using EnvelopeGenerator.Application.Extensions;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.MappingProfiles
+{
+    public class BasicDtoMappingProfile : Profile
+    {
+        public BasicDtoMappingProfile()
+        {
+            // Entity to DTO mappings
+            CreateMap<Config, ConfigDto>();
+            CreateMap<DocumentReceiverElement, DocumentReceiverElementDto>();
+            CreateMap<DocumentStatus, DocumentStatusDto>();
+            CreateMap<EmailTemplate, EmailTemplateDto>();
+            CreateMap<Envelope, EnvelopeDto>();
+            CreateMap<EnvelopeCertificate, EnvelopeCertificateDto>();
+            CreateMap<EnvelopeDocument, EnvelopeDocumentDto>();
+            CreateMap<EnvelopeHistory, EnvelopeHistoryDto>();
+            CreateMap<EnvelopeHistory, EnvelopeHistoryCreateDto>();
+            CreateMap<EnvelopeReceiver, EnvelopeReceiverDto>();
+            CreateMap<EnvelopeReceiver, EnvelopeReceiverSecretDto>();
+            CreateMap<EnvelopeType, EnvelopeTypeDto>();
+            CreateMap<Receiver, ReceiverReadDto>();
+            CreateMap<Receiver, ReceiverCreateDto>();
+            CreateMap<Receiver, ReceiverUpdateDto>();
+            CreateMap<UserReceiver, UserReceiverDto>();
+            CreateMap<EnvelopeReceiverReadOnly, EnvelopeReceiverReadOnlyDto>();
+
+            // DTO to Entity mappings
+            CreateMap<ConfigDto, Config>();
+            CreateMap<DocumentReceiverElementDto, DocumentReceiverElement>();
+            CreateMap<DocumentStatusDto, DocumentStatus>();
+            CreateMap<EmailTemplateDto, EmailTemplate>();
+            CreateMap<EnvelopeDto, Envelope>();
+            CreateMap<EnvelopeCertificateDto, EnvelopeCertificate>();
+            CreateMap<EnvelopeDocumentDto, EnvelopeDocument>();
+            CreateMap<EnvelopeHistoryDto, EnvelopeHistory>();
+            CreateMap<EnvelopeHistoryCreateDto, EnvelopeHistory>();
+            CreateMap<EnvelopeReceiverDto, EnvelopeReceiver>();
+            CreateMap<EnvelopeTypeDto, EnvelopeType>();
+            CreateMap<ReceiverReadDto, Receiver>().ForMember(rcv => rcv.EnvelopeReceivers, rcvReadDto => rcvReadDto.Ignore());
+            CreateMap<ReceiverCreateDto, Receiver>();
+            CreateMap<ReceiverUpdateDto, Receiver>();
+            CreateMap<UserReceiverDto, UserReceiver>();
+            CreateMap<EnvelopeReceiverBase, EnvelopeReceiverBasicDto>();
+            CreateMap<EnvelopeReceiverReadOnlyCreateDto, EnvelopeReceiverReadOnly>();
+            CreateMap<EnvelopeReceiverReadOnlyUpdateDto, EnvelopeReceiverReadOnly>();
+
+            // Messaging mappings
+            // for GTX messaging
+            CreateMap<GtxMessagingResponse, SmsResponse>()
+                .ConstructUsing(gtxRes => gtxRes.Ok()
+                    ? new SmsResponse() { Ok = true }
+                    : new SmsResponse() { Ok = false, Errors = gtxRes });
+        }
+    }
+}

EnvelopeGenerator.Application/Resources/Resource.cs

@@ -0,0 +1,9 @@
+namespace EnvelopeGenerator.Application.Resources
+{
+    /// <summary>
+    /// The place holder class for Resource.*.resx
+    /// </summary>
+    public class Resource
+    {
+    }
+}

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

@@ -0,0 +1,261 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="and" xml:space="preserve">
+    <value>und</value>
+  </data>
+  <data name="Back" xml:space="preserve">
+    <value>Zurück</value>
+  </data>
+  <data name="Complete" xml:space="preserve">
+    <value>Abschließen</value>
+  </data>
+  <data name="Confirmation" xml:space="preserve">
+    <value>Bestätigung</value>
+  </data>
+  <data name="de-DE" xml:space="preserve">
+    <value>Deutch</value>
+  </data>
+  <data name="DocProtected" xml:space="preserve">
+    <value>Dokument geschützt</value>
+  </data>
+  <data name="DocRejected" xml:space="preserve">
+    <value>Dokument abgelehnt</value>
+  </data>
+  <data name="DocSigned" xml:space="preserve">
+    <value>Dokument unterschrieben</value>
+  </data>
+  <data name="en-US" xml:space="preserve">
+    <value>Englisch</value>
+  </data>
+  <data name="EnvelopeInfo1" xml:space="preserve">
+    <value>Sie müssen {0} Vorgang unterzeichen. &lt;span class="highlight highlight-envelope-info-1"&gt;Bitte prüfen Sie die Seite {1}&lt;/span&gt;.</value>
+  </data>
+  <data name="EnvelopeInfo2" xml:space="preserve">
+    <value>Erstellt am {0} von {1}. Sie können den Absender über &lt;span class="highlight highlight-envelope-info-2"&gt;&lt;a class="mail-link" href="mailto:{2}?subject={3}&amp;body=Sehr%20geehrter%20{4}%20{5},%0A%0A%0A"&gt;{6}&lt;/a&gt;&lt;/span&gt; kontaktieren.</value>
+  </data>
+  <data name="Finalize" xml:space="preserve">
+    <value>Abschließen</value>
+  </data>
+  <data name="Hello" xml:space="preserve">
+    <value>Hallo</value>
+  </data>
+  <data name="HomePageDescription" xml:space="preserve">
+    <value>Das digitale Unterschriftenportal ist eine Plattform, die entwickelt wurde, um Ihre Dokumente sicher zu unterschreiben und zu verwalten. Mit seiner benutzerfreundlichen Oberfläche können Sie Ihre Dokumente schnell hochladen, die Unterschriftsprozesse verfolgen und Ihre digitalen Unterschriftenanwendungen einfach durchführen. Dieses Portal beschleunigt Ihren Arbeitsablauf mit rechtlich gültigen Unterschriften und erhöht gleichzeitig die Sicherheit Ihrer Dokumente.</value>
+  </data>
+  <data name="LocationWarning" xml:space="preserve">
+    <value>Bitte überprüfen Sie die Standortinformationen. Wenn sie falsch sind, korrigieren Sie diese bitte.</value>
+  </data>
+  <data name="LockedBodyAccess" xml:space="preserve">
+    <value>Wir senden Ihnen nun einen Zugriffscode an Ihre hinterlegte Email-Adresse. Dies kann evtl. einige Minuten dauern!</value>
+  </data>
+  <data name="LockedBodyAuthenticator" xml:space="preserve">
+    <value>Bitte geben Sie den in Ihrer Authenticator-App angegebenen TOTP-Code ein.</value>
+  </data>
+  <data name="LockedBodyAuthenticatorNew" xml:space="preserve">
+    <value>Wir haben den QR-Code an Ihre E-Mail-Adresse gesendet. Ihr QR-Code ist bis {0} gültig. Sie können ihn für alle Umschläge verwenden, die Sie an diese E-Mail-Adresse erhalten.</value>
+  </data>
+  <data name="LockedBodySms" xml:space="preserve">
+    <value>Wir haben soeben den Zugangscode als SMS an die von Ihnen angegebene Telefonnummer gesendet.</value>
+  </data>
+  <data name="LockedCodeLabelAccess" xml:space="preserve">
+    <value>Zugriffscode</value>
+  </data>
+  <data name="LockedCodeLabelAuthenticator" xml:space="preserve">
+    <value>TOTP</value>
+  </data>
+  <data name="LockedCodeLabelSms" xml:space="preserve">
+    <value>SMS-Code</value>
+  </data>
+  <data name="LockedFooterBodyAccess" xml:space="preserve">
+    <value>Bitte überprüfen Sie Ihr Email Postfach inklusive Spam-Ordner. Sie können auch den Absender &lt;a class="mail-link" href="mailto:{0}?subject={1}&amp;body={2}" target="_blank"&gt;{0}&lt;/a&gt; bitten, Ihnen den Code auf anderem Wege zukommen zu lassen.</value>
+  </data>
+  <data name="LockedFooterBodyAuthenticator" xml:space="preserve">
+    <value>Der neue QR-Code wird nur einmal für einen bestimmten Zeitraum gesendet und nach dem Scannen in Ihrer Authenticator-App gespeichert. Er kann für alle Umschläge verwendet werden, die an dieselbe E-Mail-Adresse gesendet werden, bis er abläuft. Wenn Sie die QR-Code-Mail nicht erhalten oder sie sowohl aus der Mail als auch aus authenticator löschen, kontaktieren Sie bitte den Absender.</value>
+  </data>
+  <data name="LockedFooterBodySms" xml:space="preserve">
+    <value>Sie können den Absender bitten, Ihre Rufnummer zu überprüfen. Die Telefonnummer muss mit der Ortsvorwahl eingegeben werden. Andernfalls können Sie beantragen, den Zwei-Faktor-Schutz zu entfernen.</value>
+  </data>
+  <data name="LockedFooterTitleAccess" xml:space="preserve">
+    <value>Sie haben keinen Zugriffscode erhalten?</value>
+  </data>
+  <data name="LockedFooterTitleAuthenticator" xml:space="preserve">
+    <value>Sie haben keinen QR-Code erhalten?</value>
+  </data>
+  <data name="LockedFooterTitleSms" xml:space="preserve">
+    <value>Sie haben keine SMS erhalten?</value>
+  </data>
+  <data name="LockedTitleAccess" xml:space="preserve">
+    <value>Dokument erfordert einen Zugriffscode</value>
+  </data>
+  <data name="LockedTitleAuthenticator" xml:space="preserve">
+    <value>2-Faktor-Authentifizierung</value>
+  </data>
+  <data name="LockedTitleSms" xml:space="preserve">
+    <value>2-Faktor-Authentifizierung</value>
+  </data>
+  <data name="Privacy" xml:space="preserve">
+    <value>Datenschutz</value>
+  </data>
+  <data name="ReadOnlyMessage" xml:space="preserve">
+    <value>Weitergeleitet von {0}. Gültig bis {1}.</value>
+  </data>
+  <data name="Reject" xml:space="preserve">
+    <value>Ablehnen</value>
+  </data>
+  <data name="Rejection" xml:space="preserve">
+    <value>Ablehnung</value>
+  </data>
+  <data name="RejectionInfo1" xml:space="preserve">
+    <value>Dieser Unterzeichnungsvorgang wurde abgelehnt!</value>
+  </data>
+  <data name="RejectionInfo1_ext" xml:space="preserve">
+    <value>Vorgang abgebrochen!</value>
+  </data>
+  <data name="RejectionInfo2" xml:space="preserve">
+    <value>Sie können bei Bedarf mit {0}, &lt;a href="mailto:{1}?subject={2}&amp;body=Sehr geehrte(r)%20{0},%0A%0A%0A"&gt;{1}&lt;/a&gt; Kontakt aufnehmen.</value>
+  </data>
+  <data name="RejectionInfo2_ext" xml:space="preserve">
+    <value>Das Vorgang wurde von einer der beteiligten Parteien abgelehnt. Sie können bei Bedarf mit {0}, &lt;a href="mailto:{1}?subject={2}&amp;body=Sehr geehrte(r)%20{0},%0A%0A%0A"&gt;{1}&lt;/a&gt; Kontakt aufnehmen.</value>
+  </data>
+  <data name="RejectionReasonQ" xml:space="preserve">
+    <value>Bitte geben Sie einen Grund an:</value>
+  </data>
+  <data name="SigAgree" xml:space="preserve">
+    <value>Durch Klick auf Abschließen stimme ich zu, dass die abgebildete und übermittelte Signatur als elektronische Darstellung meiner Signatur in den Fällen gelten, in denen ich sie auf Dokumenten, einschließlich rechtsgültiger Verträge verwende.</value>
+  </data>
+  <data name="SignDoc" xml:space="preserve">
+    <value>Dokument unterschreiben</value>
+  </data>
+  <data name="SigningProcessTitle" xml:space="preserve">
+    <value>Titel des Unterzeichnungs-Vorgangs</value>
+  </data>
+  <data name="UnexpectedError" xml:space="preserve">
+    <value>Ein unerwarteter Fehler ist aufgetreten.</value>
+  </data>
+  <data name="ViewDoc" xml:space="preserve">
+    <value>Dokument ansehen</value>
+  </data>
+  <data name="WelcomeToTheESignPortal" xml:space="preserve">
+    <value>Herzlich willkommen im eSign-Portal</value>
+  </data>
+  <data name="WrongAccessCode" xml:space="preserve">
+    <value>Ungültiger Zugangscode.</value>
+  </data>
+</root>

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

@@ -0,0 +1,261 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="and" xml:space="preserve">
+    <value>and</value>
+  </data>
+  <data name="Back" xml:space="preserve">
+    <value>Back</value>
+  </data>
+  <data name="Complete" xml:space="preserve">
+    <value>Complete</value>
+  </data>
+  <data name="Confirmation" xml:space="preserve">
+    <value>Confirmation</value>
+  </data>
+  <data name="de-DE" xml:space="preserve">
+    <value>German</value>
+  </data>
+  <data name="DocProtected" xml:space="preserve">
+    <value>Document protected</value>
+  </data>
+  <data name="DocRejected" xml:space="preserve">
+    <value>Document rejected</value>
+  </data>
+  <data name="DocSigned" xml:space="preserve">
+    <value>Document signed</value>
+  </data>
+  <data name="en-US" xml:space="preserve">
+    <value>English</value>
+  </data>
+  <data name="EnvelopeInfo1" xml:space="preserve">
+    <value>You have to sign {0} process. &lt;span class="highlight highlight-envelope-info-1"&gt;Please check page {1}&lt;/span&gt;.</value>
+  </data>
+  <data name="EnvelopeInfo2" xml:space="preserve">
+    <value>Created on {0} by {1}. You can contact the sender via &lt;span class="highlight highlight-envelope-info-2"&gt;&lt;a class="mail-link" href="mailto:{2}?subject={3}&amp;body=Dear%20{4}%20{5},%0A%0A%0A"&gt;{6}&lt;/a&gt;&lt;/span&gt;.</value>
+  </data>
+  <data name="Finalize" xml:space="preserve">
+    <value>Finalize</value>
+  </data>
+  <data name="Hello" xml:space="preserve">
+    <value>Hello</value>
+  </data>
+  <data name="HomePageDescription" xml:space="preserve">
+    <value>The Digital Signature Portal is a platform developed for securely signing and managing your documents. With its user-friendly interface, you can quickly upload your documents, track the signing processes, and easily carry out your digital signature applications. This portal accelerates your workflow with legally valid signatures while enhancing the security of your documents.</value>
+  </data>
+  <data name="LocationWarning" xml:space="preserve">
+    <value>Please review the location information. If it is incorrect, kindly make the necessary corrections.</value>
+  </data>
+  <data name="LockedBodyAccess" xml:space="preserve">
+    <value>We will now send you an access code to your registered e-mail address. This may take a few minutes!</value>
+  </data>
+  <data name="LockedBodyAuthenticator" xml:space="preserve">
+    <value>Please enter the TOTP provided in your Authenticator app.</value>
+  </data>
+  <data name="LockedBodyAuthenticatorNew" xml:space="preserve">
+    <value>We have sent the QR code to your e-mail address. Your QR code is valid until {0}. You can use it for all envelopes received at this email address.</value>
+  </data>
+  <data name="LockedBodySms" xml:space="preserve">
+    <value>We have just sent the access code as an SMS to the phone number you provided.</value>
+  </data>
+  <data name="LockedCodeLabelAccess" xml:space="preserve">
+    <value>Access Code</value>
+  </data>
+  <data name="LockedCodeLabelAuthenticator" xml:space="preserve">
+    <value>TOTP</value>
+  </data>
+  <data name="LockedCodeLabelSms" xml:space="preserve">
+    <value>SMS Code</value>
+  </data>
+  <data name="LockedFooterBodyAccess" xml:space="preserve">
+    <value>Please check your email inbox including the spam folder. You can also ask the sender &lt;a class="mail-link" href="mailto:{0}?subject={1}&amp;body={2}" target="_blank"&gt;{0}&lt;/a&gt; to send you the code by other means.</value>
+  </data>
+  <data name="LockedFooterBodyAuthenticator" xml:space="preserve">
+    <value>The new QR code is sent only once for a given period and is saved in your authenticator app once scanned. It can be used for all envelopes received at the same email address until it expires. If you do not receive the QR code mail or delete it both from the mail and from authenticator, please contact the sender.</value>
+  </data>
+  <data name="LockedFooterBodySms" xml:space="preserve">
+    <value>You can ask the sender to check your phone number. The phone number must be entered with the area code. Otherwise you can request to remove the two-factor protection.</value>
+  </data>
+  <data name="LockedFooterTitleAccess" xml:space="preserve">
+    <value>You have not received an access code?</value>
+  </data>
+  <data name="LockedFooterTitleAuthenticator" xml:space="preserve">
+    <value>You have not received a QR code?</value>
+  </data>
+  <data name="LockedFooterTitleSms" xml:space="preserve">
+    <value>You have not received an SMS?</value>
+  </data>
+  <data name="LockedTitleAccess" xml:space="preserve">
+    <value>Document requires an access code</value>
+  </data>
+  <data name="LockedTitleAuthenticator" xml:space="preserve">
+    <value>2-Factor Authentication</value>
+  </data>
+  <data name="LockedTitleSms" xml:space="preserve">
+    <value>2-Factor Authentication</value>
+  </data>
+  <data name="Privacy" xml:space="preserve">
+    <value>Privacy</value>
+  </data>
+  <data name="ReadOnlyMessage" xml:space="preserve">
+    <value>Forwarded by {0}. Valid until {1}.</value>
+  </data>
+  <data name="Reject" xml:space="preserve">
+    <value>Reject</value>
+  </data>
+  <data name="Rejection" xml:space="preserve">
+    <value>Rejection</value>
+  </data>
+  <data name="RejectionInfo1" xml:space="preserve">
+    <value>This signing process was rejected!</value>
+  </data>
+  <data name="RejectionInfo1_ext" xml:space="preserve">
+    <value>Process canceled!</value>
+  </data>
+  <data name="RejectionInfo2" xml:space="preserve">
+    <value>You can contact {0}, &lt;a href="mailto:{1}?subject={2}&amp;body=Dear%20{0},%0A%0A%0A"&gt;{1}&lt;/a&gt; if required.</value>
+  </data>
+  <data name="RejectionInfo2_ext" xml:space="preserve">
+    <value>The process has been rejected by one of the parties involved. You can contact {0}, &lt;a href="mailto:{1}?subject={2}&amp;body=Dear%20{0},%0A%0A%0A"&gt;{1}&lt;/a&gt; if required.</value>
+  </data>
+  <data name="RejectionReasonQ" xml:space="preserve">
+    <value>Please give a reason:</value>
+  </data>
+  <data name="SigAgree" xml:space="preserve">
+    <value>By clicking on Finalize, I agree that the signature shown and submitted is an electronic representation of my signature in cases where I use it on documents, including legally binding contracts.</value>
+  </data>
+  <data name="SignDoc" xml:space="preserve">
+    <value>Sign document</value>
+  </data>
+  <data name="SigningProcessTitle" xml:space="preserve">
+    <value>Title of the signing process</value>
+  </data>
+  <data name="UnexpectedError" xml:space="preserve">
+    <value>An unexpected error has occurred.</value>
+  </data>
+  <data name="ViewDoc" xml:space="preserve">
+    <value>View document</value>
+  </data>
+  <data name="WelcomeToTheESignPortal" xml:space="preserve">
+    <value>Welcome to the eSign portal</value>
+  </data>
+  <data name="WrongAccessCode" xml:space="preserve">
+    <value>Invalid access code.</value>
+  </data>
+</root>

EnvelopeGenerator.Application/Services/Authenticator.cs

@@ -0,0 +1,71 @@
+using EnvelopeGenerator.Application.Configurations;
+using EnvelopeGenerator.Application.Contracts.Services;
+using Microsoft.Extensions.Options;
+using OtpNet;
+using QRCoder;
+using System.Text;
+
+namespace EnvelopeGenerator.Application.Services
+{
+    public class Authenticator : IAuthenticator
+    {
+        public static Lazy<Authenticator> LazyStatic => new(() => new Authenticator(Options.Create<AuthenticatorParams>(new()), new QRCodeGenerator()));
+
+        public static Authenticator Static => LazyStatic.Value;
+
+        private readonly AuthenticatorParams _params;
+
+        private readonly QRCodeGenerator _qrCodeGenerator;
+
+        public Authenticator(IOptions<AuthenticatorParams> options, QRCodeGenerator qrCodeGenerator)
+        {
+            _params = options.Value;
+            _qrCodeGenerator = qrCodeGenerator;
+        }
+
+        public string GenerateCode(int length)
+        {
+            //TODO: Inject Random as a singleton to support multithreading to improve performance.
+            Random random = new();
+
+            if (length <= 0)
+                throw new ArgumentException("Password length must be greater than 0.");
+
+            var passwordBuilder = new StringBuilder(length);
+
+            for (int i = 0; i < length; i++)
+                passwordBuilder.Append(_params.CharPool[random.Next(_params.CharPool.Length)]);
+
+            return passwordBuilder.ToString();
+        }
+
+        public string GenerateTotpSecretKey(int? length = null)
+            => Base32Encoding.ToString(KeyGeneration.GenerateRandomKey(length ?? _params.DefaultTotpSecretKeyLength));
+
+        public byte[] GenerateTotpQrCode(string userEmail, string secretKey, string? issuer = null, string? totpUrlFormat = null, int? pixelsPerModule = null)
+        {
+            var url = string.Format(totpUrlFormat ?? _params.TotpUrlFormat,
+                Uri.EscapeDataString(userEmail),
+                Uri.EscapeDataString(secretKey),
+                Uri.EscapeDataString(issuer ?? _params.TotpIssuer));
+            using var qrCodeData = _qrCodeGenerator.CreateQrCode(url, QRCodeGenerator.ECCLevel.Q);
+            using var qrCode = new BitmapByteQRCode(qrCodeData);
+            return qrCode.GetGraphic(pixelsPerModule ?? _params.TotpQRPixelsPerModule);
+        }
+
+        public byte[] GenerateTotpQrCode(string userEmail, int? length = null, string? issuer = null, string? totpUrlFormat = null, int? pixelsPerModule = null)
+        {
+            return GenerateTotpQrCode(
+                userEmail: userEmail,
+                secretKey: GenerateTotpSecretKey(length: length),
+                issuer: issuer,
+                totpUrlFormat: totpUrlFormat,
+                pixelsPerModule: pixelsPerModule);
+        }
+
+        public string GenerateTotp(string secretKey, int step = 30) => new Totp(Base32Encoding.ToBytes(secretKey), step).ComputeTotp();
+        
+        public bool VerifyTotp(string totpCode, string secretKey, int step = 30, VerificationWindow? window = null)
+            => new Totp(Base32Encoding.ToBytes(secretKey), step).VerifyTotp(totpCode, out _, window);
+    }
+}

EnvelopeGenerator.Application/Services/ConfigService.cs

@@ -0,0 +1,59 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using DigitalData.Core.DTO;
+using EnvelopeGenerator.Application.Contracts.Services;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+using Microsoft.Extensions.Caching.Memory;
+using Microsoft.Extensions.Logging;
+namespace EnvelopeGenerator.Application.Services;
+
+public class ConfigService : ReadService<IConfigRepository, ConfigDto, Config, int>, IConfigService
+{
+		private static readonly Guid DefaultConfigCacheId = Guid.NewGuid();
+
+		private readonly IMemoryCache _cache;
+    private readonly ILogger<ConfigService> _logger;
+		public ConfigService(IConfigRepository repository, IMapper mapper, IMemoryCache memoryCache, ILogger<ConfigService> logger) : base(repository, mapper)
+    {
+			_cache = memoryCache;
+        _logger = logger;
+    }
+
+    public async Task<DataResult<ConfigDto>> ReadFirstAsync()
+    {
+        var config = await _repository.ReadFirstAsync();
+        return config is null 
+            ? Result.Fail<ConfigDto>().Notice(LogLevel.Error, Flag.DataIntegrityIssue, "There is no configuration in DB.")
+            : Result.Success(_mapper.Map<ConfigDto>(config));
+    }
+
+		/// <summary>
+		/// Reads the default configuration asynchronously.
+		/// </summary>
+		/// <remarks>
+		/// The configuration is cached in memory upon the first retrieval. If the configuration is updated, 
+		/// the application needs to be restarted for the changes to take effect as the memory cache will not be updated automatically.
+		/// </remarks>
+		/// <returns>
+		/// A task that represents the asynchronous read operation. The task result contains the default configuration as a <see cref="ConfigDto"/>.
+		/// </returns>
+		/// <exception cref="InvalidOperationException">
+		/// Thrown when the default configuration cannot be found.
+		/// </exception>
+		public async Task<ConfigDto> ReadDefaultAsync()
+    {
+        var config = await _cache.GetOrCreateAsync(DefaultConfigCacheId, _ => ReadFirstAsync().ThenAsync(
+                Success: config => config,
+                Fail: (mssg, ntc) =>
+                {
+                    _logger.LogNotice(ntc);
+                    throw new InvalidOperationException("Default configuration cannot find.");
+                }));
+
+        return config!;
+    }
+
+    public async Task<string> ReadDefaultSignatureHost() => (await ReadDefaultAsync()).SignatureHost;
+}

EnvelopeGenerator.Application/Services/DocumentReceiverElementService.cs

@@ -0,0 +1,16 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using EnvelopeGenerator.Application.Contracts.Services;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class DocumentReceiverElementService : BasicCRUDService<IDocumentReceiverElementRepository, DocumentReceiverElementDto, DocumentReceiverElement, int>, IDocumentReceiverElementService
+{
+    public DocumentReceiverElementService(IDocumentReceiverElementRepository repository, IMapper mapper)
+        : base(repository, mapper)
+    {
+    }
+}

EnvelopeGenerator.Application/Services/DocumentStatusService.cs

@@ -0,0 +1,16 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using EnvelopeGenerator.Application.Contracts.Services;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class DocumentStatusService : BasicCRUDService<IDocumentStatusRepository, DocumentStatusDto, DocumentStatus, int>, IDocumentStatusService
+{
+    public DocumentStatusService(IDocumentStatusRepository repository, IMapper mapper)
+        : base(repository, mapper)
+    {
+    }
+}

EnvelopeGenerator.Application/Services/EmailTemplateService.cs

@@ -0,0 +1,29 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+using static EnvelopeGenerator.Common.Constants;
+using DigitalData.Core.DTO;
+using Microsoft.Extensions.Logging;
+using EnvelopeGenerator.Application.Contracts.Services;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class EmailTemplateService : BasicCRUDService<IEmailTemplateRepository, EmailTemplateDto, EmailTemplate, int>, IEmailTemplateService
+{
+    public EmailTemplateService(IEmailTemplateRepository repository, IMapper mapper)
+        : base(repository, mapper)
+    {
+    }
+
+    public async Task<DataResult<EmailTemplateDto>> ReadByNameAsync(EmailTemplateType type)
+    {
+        var temp = await _repository.ReadByNameAsync(type);
+        return temp is null 
+            ? Result.Fail<EmailTemplateDto>()
+                .Message(Key.InnerServiceError)
+                .Notice(LogLevel.Error, Flag.DataIntegrityIssue, $"EmailTemplateType '{type}' is not found in DB. Please, define required e-mail template.")
+            : Result.Success(_mapper.Map<EmailTemplateDto>(temp));
+    }
+}

EnvelopeGenerator.Application/Services/EnvelopeCertificateService.cs

@@ -0,0 +1,17 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using Microsoft.Extensions.Localization;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+using EnvelopeGenerator.Application.Contracts.Services;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class EnvelopeCertificateService : BasicCRUDService<IEnvelopeCertificateRepository, EnvelopeCertificateDto, EnvelopeCertificate, int>, IEnvelopeCertificateService
+{
+    public EnvelopeCertificateService(IEnvelopeCertificateRepository repository, IMapper mapper)
+        : base(repository, mapper)
+    {
+    }
+}

EnvelopeGenerator.Application/Services/EnvelopeDocumentService.cs

@@ -0,0 +1,15 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using EnvelopeGenerator.Application.Contracts.Services;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class EnvelopeDocumentService : BasicCRUDService<IEnvelopeDocumentRepository, EnvelopeDocumentDto, EnvelopeDocument, int>, IEnvelopeDocumentService
+{
+    public EnvelopeDocumentService(IEnvelopeDocumentRepository repository, IMapper mapper) : base(repository, mapper)
+    {
+    }
+}

EnvelopeGenerator.Application/Services/EnvelopeHistoryService.cs

@@ -0,0 +1,84 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+using static EnvelopeGenerator.Common.Constants;
+using DigitalData.Core.DTO;
+using EnvelopeGenerator.Application.DTOs.EnvelopeHistory;
+using EnvelopeGenerator.Application.DTOs.Receiver;
+using EnvelopeGenerator.Application.Contracts.Services;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class EnvelopeHistoryService : CRUDService<IEnvelopeHistoryRepository, EnvelopeHistoryCreateDto, EnvelopeHistoryDto, EnvelopeHistoryDto, EnvelopeHistory, long>, IEnvelopeHistoryService
+{
+    public EnvelopeHistoryService(IEnvelopeHistoryRepository repository, IMapper mapper)
+        : base(repository, mapper)
+    {
+    }
+
+    public async Task<int> CountAsync(int? envelopeId = null, string? userReference = null, int? status = null) => await _repository.CountAsync(envelopeId: envelopeId, userReference: userReference, status: status);
+
+    public async Task<bool> HasStatus(EnvelopeStatus status, int envelopeId, string userReference) => await _repository.CountAsync(
+        envelopeId: envelopeId,
+        userReference: userReference,
+        status: (int) status) > 0;
+
+    public async Task<bool> AccessCodeAlreadyRequested(int envelopeId, string userReference) => await _repository.CountAsync(
+        envelopeId: envelopeId,
+        userReference:userReference,
+        status: (int) EnvelopeStatus.AccessCodeRequested) > 0;
+
+    public async Task<bool> IsSigned(int envelopeId, string userReference) => await _repository.CountAsync(
+        envelopeId: envelopeId,
+        userReference: userReference,
+        status: (int) EnvelopeStatus.DocumentSigned) > 0;
+
+    /// <summary>
+    /// Checks if the specified envelope has been rejected.
+    /// <para><b>Note:</b> <i>If any document within the envelope is rejected, the entire envelope will be considered rejected.</i></para>
+    /// </summary>
+    /// <param name="envelopeId">The ID of the envelope to check.</param>
+    /// <param name="userReference">Optional user reference associated with the envelope.</param>
+    /// <returns>A task that represents the asynchronous operation. The task result contains a boolean value indicating whether the envelope is rejected.</returns>
+    public async Task<bool> IsRejected(int envelopeId, string? userReference = null)
+    {
+        return await _repository.CountAsync(
+            envelopeId: envelopeId,
+            userReference: userReference,
+            status: (int)EnvelopeStatus.DocumentRejected) > 0;
+    }
+
+    public async Task<IEnumerable<EnvelopeHistoryDto>> ReadAsync(int? envelopeId = null, string? userReference = null, ReferenceType? referenceType = null, int? status = null, bool withSender = false, bool withReceiver = false)
+    {
+        var histDTOs = _mapper.Map<IEnumerable<EnvelopeHistoryDto>>(
+                    await _repository.ReadAsync(
+                                envelopeId: envelopeId,
+                                userReference: userReference,
+                                status: status,
+                                withSender: withSender,
+                                withReceiver: withReceiver));
+        return referenceType is null ? histDTOs : histDTOs.Where(h => h.ReferenceType == referenceType);
+    }
+
+    public async Task<IEnumerable<EnvelopeHistoryDto>> ReadRejectedAsync(int envelopeId, string? userReference = null) =>
+        await ReadAsync(envelopeId: envelopeId, userReference: userReference, status: (int)EnvelopeStatus.DocumentRejected, withReceiver:true);
+
+		//TODO: use IQueryable in repository to incerease the performance
+		public async Task<IEnumerable<ReceiverReadDto>> ReadRejectingReceivers(int envelopeId)
+		{
+			var envelopes = await ReadRejectedAsync(envelopeId);
+        return envelopes is null
+            ? Enumerable.Empty<ReceiverReadDto>()
+            : envelopes
+                .Where(eh => eh?.Receiver != null)
+                .Select(eh => eh.Receiver!);
+		}
+
+		public async Task<DataResult<long>> RecordAsync(int envelopeId, string userReference, EnvelopeStatus status, string? comment = null) => 
+        await CreateAsync(new (EnvelopeId: envelopeId, UserReference: userReference, Status: (int)status, ActionDate: DateTime.Now, Comment: comment))
+            .ThenAsync(
+                Success: id => Result.Success(id),
+                Fail: (mssg, ntc) => Result.Fail<long>().Message(mssg).Notice(ntc)
+            );
+}

EnvelopeGenerator.Application/Services/EnvelopeMailService.cs

@@ -0,0 +1,175 @@
+using AutoMapper;
+using DigitalData.Core.DTO;
+using DigitalData.EmailProfilerDispatcher.Abstraction.Contracts;
+using DigitalData.EmailProfilerDispatcher.Abstraction.DTOs.EmailOut;
+using DigitalData.EmailProfilerDispatcher.Abstraction.Services;
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiver;
+using EnvelopeGenerator.Common;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using static EnvelopeGenerator.Common.Constants;
+using EnvelopeGenerator.Extensions;
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiverReadOnly;
+using EnvelopeGenerator.Application.Configurations;
+using EnvelopeGenerator.Application.Extensions;
+using Newtonsoft.Json;
+using EnvelopeGenerator.Application.Contracts.Services;
+
+namespace EnvelopeGenerator.Application.Services
+{
+    public class EnvelopeMailService : EmailOutService, IEnvelopeMailService
+    {
+		private readonly IEmailTemplateService _tempService;
+		private readonly IEnvelopeReceiverService _envRcvService;
+		private readonly DispatcherParams _dConfig;
+		private readonly IConfigService _configService;
+		private readonly Dictionary<string, string> _placeholders;
+		private readonly IAuthenticator _authenticator;
+
+        public EnvelopeMailService(IEmailOutRepository repository, IMapper mapper, IEmailTemplateService tempService, IEnvelopeReceiverService envelopeReceiverService, IOptions<DispatcherParams> dispatcherConfigOptions, IConfigService configService, IOptions<MailParams> mailConfig, IAuthenticator authenticator) : base(repository, mapper)
+        {
+            _tempService = tempService;
+			_envRcvService = envelopeReceiverService;
+			_dConfig = dispatcherConfigOptions.Value;
+			_configService = configService;
+			_placeholders = mailConfig.Value.Placeholders;
+			_authenticator = authenticator;
+        }
+
+		private async Task<Dictionary<string, string>> CreatePlaceholders(string? accessCode = null, EnvelopeReceiverDto? envelopeReceiverDto = null)
+		{
+			if (accessCode is not null)
+                _placeholders["[DOCUMENT_ACCESS_CODE]"] = accessCode;
+
+			if(envelopeReceiverDto?.Envelope is not null && envelopeReceiverDto.Receiver is not null)
+			{
+				var erId = (envelopeReceiverDto.Envelope.Uuid, envelopeReceiverDto.Receiver.Signature).EncodeEnvelopeReceiverId();
+				var sigHost = await _configService.ReadDefaultSignatureHost();
+				var linkToDoc = $"{sigHost}/EnvelopeKey/{erId}";
+				_placeholders["[LINK_TO_DOCUMENT]"] = linkToDoc;
+				_placeholders["[LINK_TO_DOCUMENT_TEXT]"] = linkToDoc[..Math.Min(40, linkToDoc.Length)] + "..";
+			}
+
+			return _placeholders;
+		}
+
+        private async Task<Dictionary<string, string>> CreatePlaceholders(EnvelopeReceiverReadOnlyDto? readOnlyDto = null)
+        {
+            if (readOnlyDto?.Envelope is not null && readOnlyDto.Receiver is not null)
+            {
+                _placeholders["[NAME_RECEIVER]"] = await _envRcvService.ReadLastUsedReceiverNameByMail(readOnlyDto.AddedWho).ThenAsync(res => res, (msg, ntc) => string.Empty) ?? string.Empty;
+                var erReadOnlyId = (readOnlyDto.Id).EncodeEnvelopeReceiverId();
+                var sigHost = await _configService.ReadDefaultSignatureHost();
+                var linkToDoc = $"{sigHost}/EnvelopeKey/{erReadOnlyId}";
+                _placeholders["[LINK_TO_DOCUMENT]"] = linkToDoc;
+                _placeholders["[LINK_TO_DOCUMENT_TEXT]"] = linkToDoc[..Math.Min(40, linkToDoc.Length)] + "..";
+            }
+
+            return _placeholders;
+        }
+		
+        public async Task<DataResult<int>> SendAsync(EnvelopeReceiverDto dto, EmailTemplateType tempType, Dictionary<string, object>? optionalPlaceholders = null)
+        {
+			var tempSerResult = await _tempService.ReadByNameAsync(tempType);
+			if (tempSerResult.IsFailed)
+				return tempSerResult.ToFail<int>().Notice(LogLevel.Error, Flag.DataIntegrityIssue, $"The email cannot send because '{tempType}' template cannot found.");
+			var temp = tempSerResult.Data;
+
+			var mail = new EmailOutCreateDto()
+			{
+				EmailAddress = dto.Receiver!.EmailAddress,
+				EmailSubj = temp.Subject,
+				EmailBody = temp.Body,
+				//email_type = envelope_status,
+				//message = envelope_message,
+				ReferenceId = dto.EnvelopeId,               //REFERENCE_ID = ENVELOPE_ID
+				ReferenceString = dto!.Envelope!.Uuid,		//REFERENCE_STRING = ENVELOPE_UUID
+				//receiver_name = receiver.name,
+				//receiver_access_code = receiver.access_code,
+				//sender_adress = envelope.user.email,
+				//sender_name = envelope.user.full_name,
+				//envelope_title = envelope.title,
+				ReminderTypeId = _dConfig.ReminderTypeId,
+				SendingProfile = _dConfig.SendingProfile,
+				EntityId = null,
+				WfId = (int) EnvelopeStatus.MessageAccessCodeSent,
+				WfReference = null,
+				AddedWho = _dConfig.AddedWho,
+				EmailAttmt1 = _dConfig.EmailAttmt1
+			};
+
+			//get acccess code
+			var acResult = await _envRcvService.ReadAccessCodeByIdAsync(envelopeId: dto.EnvelopeId, receiverId: dto.ReceiverId);
+			if (acResult.IsFailed)
+				return acResult.ToFail<int>().Notice(LogLevel.Error, "Therefore, access code cannot be sent");
+			var accessCode = acResult.Data;
+			
+			var placeholders = await CreatePlaceholders(accessCode: accessCode, envelopeReceiverDto: dto);
+
+			// Add optional place holders.
+			if (optionalPlaceholders is not null)
+				foreach (var oph in optionalPlaceholders)
+					placeholders[oph.Key] = oph.Value.ToString() ?? "NULL";
+
+			//TODO: remove the requirement to add the models using reflections
+			return await CreateWithTemplateAsync(createDto: mail,placeholders: placeholders,
+				dto, dto.Envelope.User!, dto.Envelope);
+		}
+
+		public async Task<DataResult<int>> SendAsync(EnvelopeReceiverReadOnlyDto dto, Dictionary<string, object>? optionalPlaceholders = null)
+		{
+            var tempSerResult = await _tempService.ReadByNameAsync(EmailTemplateType.DocumentShared);
+            if (tempSerResult.IsFailed)
+                return tempSerResult.ToFail<int>().Notice(LogLevel.Error, Flag.DataIntegrityIssue, $"The email cannot send because '{Constants.EmailTemplateType.DocumentShared}' template cannot found.");
+            var temp = tempSerResult.Data;
+
+            var mail = new EmailOutCreateDto()
+            {
+                EmailAddress = dto.ReceiverMail,
+                EmailSubj = temp.Subject,
+                EmailBody = temp.Body,
+				//TODO: remove int casting when all 
+                ReferenceId = (int) dto.EnvelopeId,			//REFERENCE_ID = ENVELOPE_ID
+                ReferenceString = dto.Envelope!.Uuid,		//REFERENCE_STRING = ENVELOPE_UUID
+                                                            //receiver_name = receiver.name,
+                                                            //receiver_access_code = receiver.access_code,
+                                                            //sender_adress = envelope.user.email,
+                                                            //sender_name = envelope.user.full_name,
+                                                            //envelope_title = envelope.title,
+                ReminderTypeId = _dConfig.ReminderTypeId,
+                SendingProfile = _dConfig.SendingProfile,
+                EntityId = null,
+                WfId = (int)EnvelopeStatus.EnvelopeShared,
+                WfReference = null,
+                AddedWho = _dConfig.AddedWho,
+                EmailAttmt1 = _dConfig.EmailAttmt1
+            };
+
+            var placeholders = await CreatePlaceholders(readOnlyDto: dto);
+
+            // Add optional place holders.
+            if (optionalPlaceholders is not null)
+                foreach (var oph in optionalPlaceholders)
+                placeholders[oph.Key] = oph.Value.ToString() ?? "NULL";
+
+            return await CreateWithTemplateAsync(createDto: mail, placeholders: placeholders, dto.Envelope);
+        }
+
+        public async Task<DataResult<int>> SendAccessCodeAsync(EnvelopeReceiverDto dto) => await SendAsync(dto: dto, tempType: EmailTemplateType.DocumentAccessCodeReceived);
+
+        public Task<DataResult<int>> SendTFAQrCodeAsync(EnvelopeReceiverDto dto)
+        {
+            // Check if receiver or secret key is null
+            if (dto.Receiver is null)
+                throw new ArgumentNullException(nameof(dto), $"TFA Qr Code cannot sent. Receiver information is missing. Envelope receiver dto is {JsonConvert.SerializeObject(dto)}");
+            if (dto.Receiver.TotpSecretkey is null)
+                throw new ArgumentNullException(nameof(dto), $"TFA Qr Code cannot sent. Receiver.TotpSecretKey is null. Envelope receiver dto is {JsonConvert.SerializeObject(dto)}");
+
+            var totp_qr_64 = _authenticator.GenerateTotpQrCode(userEmail: dto.Receiver.EmailAddress, secretKey: dto.Receiver.TotpSecretkey).ToBase64String();
+            return SendAsync(dto, EmailTemplateType.TotpSecret, new()
+			{
+				{"[TFA_QR_CODE]", totp_qr_64 },
+			});
+        }
+    }
+}

EnvelopeGenerator.Application/Services/EnvelopeReceiverReadOnlyService.cs

@@ -0,0 +1,15 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using EnvelopeGenerator.Application.Contracts.Services;
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiverReadOnly;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class EnvelopeReceiverReadOnlyService : CRUDService<IEnvelopeReceiverReadOnlyRepository, EnvelopeReceiverReadOnlyCreateDto, EnvelopeReceiverReadOnlyDto, EnvelopeReceiverReadOnlyUpdateDto, EnvelopeReceiverReadOnly, long>, IEnvelopeReceiverReadOnlyService
+{
+    public EnvelopeReceiverReadOnlyService(IEnvelopeReceiverReadOnlyRepository repository, IMapper mapper) : base(repository, mapper)
+    {
+    }
+}

EnvelopeGenerator.Application/Services/EnvelopeReceiverService.cs

@@ -0,0 +1,183 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using DigitalData.Core.DTO;
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiver;
+using EnvelopeGenerator.Application.Resources;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+using Microsoft.Extensions.Localization;
+using Microsoft.Extensions.Logging;
+using EnvelopeGenerator.Extensions;
+using EnvelopeGenerator.Application.DTOs.Messaging;
+using EnvelopeGenerator.Application.Contracts.Services;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class EnvelopeReceiverService : BasicCRUDService<IEnvelopeReceiverRepository, EnvelopeReceiverDto, EnvelopeReceiver, (int Envelope, int Receiver)>, IEnvelopeReceiverService
+{
+    private readonly IStringLocalizer<Resource> _localizer;
+
+    private readonly ISmsSender _smsSender;
+
+    public EnvelopeReceiverService(IEnvelopeReceiverRepository repository, IStringLocalizer<Resource> localizer, IMapper mapper, ISmsSender smsSender)
+        : base(repository, mapper)
+    {
+        _localizer = localizer;
+        _smsSender = smsSender;
+    }
+
+    public async Task<DataResult<IEnumerable<EnvelopeReceiverDto>>> ReadBySignatureAsync(string signature, bool withEnvelope = false, bool withReceiver = true, bool readOnly = true)
+    {
+        var env_rcvs = await _repository.ReadBySignatureAsync(signature: signature, withEnvelope: withEnvelope, withReceiver: withReceiver, readOnly: readOnly);
+        return Result.Success(_mapper.Map<IEnumerable<EnvelopeReceiverDto>>(env_rcvs));
+    }
+
+    public async Task<DataResult<IEnumerable<EnvelopeReceiverDto>>> ReadByUuidAsync(string uuid, bool withEnvelope = true, bool withReceiver = false, bool readOnly = true)
+    {
+        var env_rcvs = await _repository.ReadByUuidAsync(uuid: uuid, withEnvelope: withEnvelope, withReceiver: withReceiver, readOnly: readOnly);
+        return Result.Success(_mapper.Map<IEnumerable<EnvelopeReceiverDto>>(env_rcvs));
+    }
+
+    public async Task<DataResult<IEnumerable<string?>>> ReadAccessCodeByUuidAsync(string uuid, bool withEnvelope = false, bool withReceiver = true)
+    {
+        var env_rcvs = await _repository.ReadByUuidAsync(uuid: uuid, withEnvelope: withEnvelope, withReceiver: withReceiver);
+        return Result.Success(env_rcvs.Select(er => er.AccessCode));
+    }
+
+    public async Task<DataResult<EnvelopeReceiverDto>> ReadByUuidSignatureAsync(string uuid, string signature, bool withEnvelope = true, bool withReceiver = true, bool readOnly = true)
+    {
+        var env_rcv = await _repository.ReadByUuidSignatureAsync(uuid: uuid, signature: signature, withEnvelope: withEnvelope, withReceiver: withReceiver, readOnly: readOnly);
+        if (env_rcv is null)
+            return Result.Fail<EnvelopeReceiverDto>()
+                .Message(Key.EnvelopeReceiverNotFound);
+
+        return Result.Success(_mapper.Map<EnvelopeReceiverDto>(env_rcv));
+    }
+
+    public async Task<DataResult<EnvelopeReceiverSecretDto>> ReadWithSecretByUuidSignatureAsync(string uuid, string signature, bool withEnvelope = true, bool withReceiver = true, bool readOnly = true)
+    {
+        var env_rcv = await _repository.ReadByUuidSignatureAsync(uuid: uuid, signature: signature, withEnvelope: withEnvelope, withReceiver: withReceiver, readOnly: readOnly);
+        if (env_rcv is null)
+            return Result.Fail<EnvelopeReceiverSecretDto>()
+                .Message(Key.EnvelopeReceiverNotFound);
+
+        return Result.Success(_mapper.Map<EnvelopeReceiverSecretDto>(env_rcv));
+    }
+
+    public async Task<DataResult<EnvelopeReceiverDto>> ReadByEnvelopeReceiverIdAsync(string envelopeReceiverId, bool withEnvelope = true, bool withReceiver = true, bool readOnly = true)
+    {
+        (string? uuid, string? signature)  = envelopeReceiverId.DecodeEnvelopeReceiverId();
+
+        if (uuid is null || signature is null)
+            return Result.Fail<EnvelopeReceiverDto>()
+                .Message(_localizer[Key.WrongEnvelopeReceiverId])
+                .Notice(LogLevel.Warning, (uuid, signature).ToTitle())
+                .Notice(LogLevel.Warning, EnvelopeFlag.WrongEnvelopeReceiverId)
+                .Notice(LogLevel.Warning, Flag.PossibleSecurityBreach);
+
+        return await ReadByUuidSignatureAsync(uuid: uuid, signature: signature, withEnvelope: withEnvelope, withReceiver: withReceiver, readOnly: readOnly);
+    }
+
+    public async Task<DataResult<bool>> VerifyAccessCodeAsync(string uuid, string signature, string accessCode)
+    {
+        var er = await _repository.ReadByUuidSignatureAsync(uuid: uuid, signature: signature);
+
+        if (er is null)
+            return Result.Fail<bool>()
+                .Message(_localizer[Key.EnvelopeOrReceiverNonexists])
+                .Notice(LogLevel.Warning, (uuid, signature).ToTitle())
+                .Notice(LogLevel.Warning, EnvelopeFlag.EnvelopeOrReceiverNonexists)
+                .Notice(LogLevel.Warning, Flag.PossibleDataIntegrityIssue);
+
+        var actualAccessCode = er.AccessCode;
+
+        if (actualAccessCode is null)
+            return Result.Fail<bool>()
+                .Message(_localizer[Key.AccessCodeNull])
+                .Notice(LogLevel.Critical, (uuid, signature).ToTitle())
+                .Notice(LogLevel.Critical, EnvelopeFlag.AccessCodeNull)
+                .Notice(LogLevel.Critical, Flag.DataIntegrityIssue);
+
+        else if (accessCode != actualAccessCode)
+            return Result.Success(false).Message(_localizer[Key.WrongAccessCode]);
+        else
+            return Result.Success(true);
+    }
+
+    public async Task<DataResult<bool>> VerifyAccessCodeAsync(string envelopeReceiverId, string accessCode)
+    {
+        (string? uuid, string? signature) = envelopeReceiverId.DecodeEnvelopeReceiverId();
+
+        if (uuid is null || signature is null)
+            return Result.Fail<bool>()
+                .Message(Key.WrongEnvelopeReceiverId)
+                .Notice(LogLevel.Critical, EnvelopeFlag.WrongEnvelopeReceiverId)
+                .Notice(LogLevel.Critical, Flag.SecurityBreach)
+                .Notice(LogLevel.Critical, "Attempt to verify access code detected. Such actions are generally not initiated by well-intentioned users. Potential security breach suspected. Immediate investigation required.");
+
+        return await VerifyAccessCodeAsync(uuid: uuid, signature: signature, accessCode: accessCode);
+    }
+
+    public async Task<DataResult<bool>> IsExisting(string envelopeReceiverId)
+    {
+        (string? uuid, string? signature) = envelopeReceiverId.DecodeEnvelopeReceiverId();
+
+        if (uuid is null || signature is null)
+            return Result.Fail<bool>().Notice(LogLevel.Warning, EnvelopeFlag.NonDecodableEnvelopeReceiverId, "In IsExisting(string envelopeReceiverId)");
+
+        int count = await _repository.CountAsync(uuid:uuid, signature:signature);
+        return Result.Success(count > 0);
+    }
+
+		public async Task<DataResult<string>> ReadAccessCodeByIdAsync(int envelopeId, int receiverId)
+		{
+        var code = await _repository.ReadAccessCodeByIdAsync(envelopeId: envelopeId, receiverId: receiverId);
+        return code is null ? 
+            Result.Fail<string>().Notice(LogLevel.Error, Flag.DataIntegrityIssue, $"Access code is null. Envelope ID is {envelopeId} and receiver ID {receiverId}")
+            : Result.Success(code);
+		}
+
+    public async Task<DataResult<IEnumerable<EnvelopeReceiverDto>>> ReadByUsernameAsync(string username, int? min_status = null, int? max_status = null, params int[] ignore_statuses)
+    {
+        var er_list = await _repository.ReadByUsernameAsync(username: username, min_status: min_status, max_status: max_status, ignore_statuses: ignore_statuses);
+        var dto_list = _mapper.Map<IEnumerable<EnvelopeReceiverDto>>(er_list);
+        return Result.Success(dto_list);
+    }
+
+    public async Task<DataResult<string?>> ReadLastUsedReceiverNameByMail(string mail)
+    {
+        var er = await _repository.ReadLastByReceiver(mail);
+        return er is null ? Result.Fail<string?>().Notice(LogLevel.None, Flag.NotFound) : Result.Success(er.Name);
+    }
+
+    public async Task<DataResult<SmsResponse>> SendSmsAsync(string envelopeReceiverId, string message)
+    {
+        (string? uuid, string? signature) = envelopeReceiverId.DecodeEnvelopeReceiverId();
+
+        if (uuid is null || signature is null)
+            return Result.Fail<SmsResponse>()
+                .Message(_localizer[Key.WrongEnvelopeReceiverId])
+                .Notice(LogLevel.Warning, (uuid, signature).ToTitle())
+                .Notice(LogLevel.Warning, EnvelopeFlag.WrongEnvelopeReceiverId)
+                .Notice(LogLevel.Warning, Flag.PossibleSecurityBreach);
+
+        var env_rcv = await _repository.ReadByUuidSignatureAsync(uuid: uuid, signature: signature, withEnvelope: false, withReceiver: false);
+        if (env_rcv is null)
+            return Result.Fail<SmsResponse>()
+                .Message(Key.EnvelopeReceiverNotFound);
+
+        if (env_rcv.PhoneNumber is null)
+            return Result.Fail<SmsResponse>()
+                .Message(Key.PhoneNumberNonexists)
+                .Notice(LogLevel.Error, Flag.NotFound, $"An attempt was made to send sms to the user whose phone number is null. Envelope recipient ID is {envelopeReceiverId}, UUID is {uuid} and signature is {signature}.");
+
+        var res = await _smsSender.SendSmsAsync(recipient: env_rcv.PhoneNumber, message: message);
+
+        return Result.Success(res);
+    }
+
+    public Task<DataResult<IEnumerable<EnvelopeReceiverSecretDto>>> ReadWithSecretByUuidAsync(string uuid)
+    {
+        throw new NotImplementedException();
+    }
+}

EnvelopeGenerator.Application/Services/EnvelopeService.cs

@@ -0,0 +1,42 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using DigitalData.Core.DTO;
+using EnvelopeGenerator.Application.Contracts.Services;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class EnvelopeService : BasicCRUDService<IEnvelopeRepository, EnvelopeDto, Envelope, int>, IEnvelopeService
+{
+    public EnvelopeService(IEnvelopeRepository repository, IMapper mapper)
+        : base(repository, mapper)
+    {
+    }
+
+    public async Task<DataResult<IEnumerable<EnvelopeDto>>> ReadAllWithAsync(bool documents = false, bool history = false, bool documentReceiverElement = false)
+    {
+        var envelopes = await _repository.ReadAllWithAsync(documents: documents, history: history, documentReceiverElement: documentReceiverElement);
+        var readDto = _mapper.Map<IEnumerable<EnvelopeDto>>(envelopes);
+        return Result.Success(readDto);
+    }
+
+    public async Task<DataResult<EnvelopeDto>> ReadByUuidAsync(string uuid, bool withDocuments = false, bool withHistory = false, bool withDocumentReceiverElement = false, bool withUser = false, bool withAll = false)
+    {
+        var envelope = await _repository.ReadByUuidAsync(uuid: uuid, withDocuments: withDocuments, withHistory: withHistory, withDocumentReceiverElement: withDocumentReceiverElement, withUser:withUser, withAll:withAll);
+
+        if (envelope is null)
+            return Result.Fail<EnvelopeDto>();
+
+        var readDto = _mapper.Map<EnvelopeDto>(envelope);
+        return Result.Success(readDto);
+    }
+
+    public async Task<DataResult<IEnumerable<EnvelopeDto>>> ReadByUserAsync(int userId, int? min_status = null, int? max_status = null, params int[] ignore_statuses)
+    {
+        var users = await _repository.ReadByUserAsync(userId: userId, min_status: min_status, max_status: max_status, ignore_statuses: ignore_statuses);            
+        var readDto = _mapper.Map<IEnumerable<EnvelopeDto>>(users);
+        return Result.Success(readDto);
+    }
+}

EnvelopeGenerator.Application/Services/EnvelopeSmsHandler.cs

@@ -0,0 +1,54 @@
+using EnvelopeGenerator.Application.Configurations;
+using EnvelopeGenerator.Application.Contracts.Services;
+using EnvelopeGenerator.Application.DTOs.EnvelopeReceiver;
+using EnvelopeGenerator.Application.DTOs.Messaging;
+using EnvelopeGenerator.Application.Extensions;
+using Microsoft.Extensions.Caching.Distributed;
+using Microsoft.Extensions.Options;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class EnvelopeSmsHandler : IEnvelopeSmsHandler
+{
+    private readonly ISmsSender _sender;
+
+    private readonly TotpSmsParams _totpSmsParams;
+
+    private readonly IDistributedCache _dCache;
+
+    private readonly IAuthenticator _authenticator;
+
+    public EnvelopeSmsHandler(ISmsSender sender, IOptions<TotpSmsParams> totpSmsParamsOptions, IDistributedCache distributedCache, IAuthenticator authenticator)
+    {
+        _sender = sender;
+        _totpSmsParams = totpSmsParamsOptions.Value;
+        _dCache = distributedCache;
+        _authenticator = authenticator;
+    }
+
+    /// <summary>
+    /// If expiration is passed then, sends sms and returns smsResponse and up-to-date expiration; otherwise send expiration.
+    /// </summary>
+    /// <param name="er_secret"></param>
+    /// <param name="cToken"></param>
+    /// <returns></returns>
+    public async Task<(SmsResponse? SmsResponse, DateTime Expiration)> SendTotpAsync(EnvelopeReceiverSecretDto er_secret, CancellationToken cToken = default)
+    {
+        var key = string.Format(_totpSmsParams.Expiration.CacheKeyFormat, er_secret.EnvelopeId, er_secret.ReceiverId);
+        var expiration = await _dCache.GetDateTimeAsync(key, cToken);
+
+        if(expiration is DateTime expirationDateTime && expirationDateTime >= DateTime.Now)
+            return (null, expirationDateTime);
+        else
+        {
+            var new_expiration = DateTime.Now.AddSeconds(_totpSmsParams.TotpStep);
+            var totp = _authenticator.GenerateTotp(er_secret.Receiver!.TotpSecretkey!, _totpSmsParams.TotpStep);
+            var msg = string.Format(_totpSmsParams.Format, totp, new_expiration.ToString(_totpSmsParams.Expiration.Format, _totpSmsParams.Expiration.CultureInfo));
+            await _dCache.SetDateTimeAsync(key, new_expiration, cToken: cToken);
+            return (await _sender.SendSmsAsync(er_secret.PhoneNumber!, msg), new_expiration);
+        }
+    }
+
+    public bool VerifyTotp(string totpCode, string secretKey) => _authenticator
+        .VerifyTotp(totpCode, secretKey, _totpSmsParams.TotpStep, _totpSmsParams.TotpVerificationWindow);
+}

EnvelopeGenerator.Application/Services/EnvelopeTypeService.cs

@@ -0,0 +1,29 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+using Microsoft.Extensions.Caching.Memory;
+using DigitalData.Core.DTO;
+using Microsoft.Extensions.Logging;
+using EnvelopeGenerator.Application.Contracts.Services;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class EnvelopeTypeService : BasicCRUDService<IEnvelopeTypeRepository, EnvelopeTypeDto, EnvelopeType, int>, IEnvelopeTypeService
+{
+    private static readonly Guid CacheKey = Guid.NewGuid();
+
+    private readonly IMemoryCache _cache;
+
+    public EnvelopeTypeService(IEnvelopeTypeRepository repository, IMapper mapper, IMemoryCache cache)
+        : base(repository, mapper)
+    {
+        _cache = cache;
+    }
+
+    public override async Task<DataResult<IEnumerable<EnvelopeTypeDto>>> ReadAllAsync() 
+        => await _cache.GetOrCreateAsync(CacheKey, async entry => await base.ReadAllAsync())
+        ?? Result.Fail<IEnumerable<EnvelopeTypeDto>>().Notice(LogLevel.Error, Flag.NotFound, "No cached envelope types are available in the database. If you have added any envelope types after the server started, please restart the server.");
+    
+}

EnvelopeGenerator.Application/Services/GTXSmsSender.cs

@@ -0,0 +1,40 @@
+using AutoMapper;
+using DigitalData.Core.Abstractions.Client;
+using DigitalData.Core.Client;
+using EnvelopeGenerator.Application.Configurations;
+using EnvelopeGenerator.Application.Contracts.Services;
+using EnvelopeGenerator.Application.DTOs.Messaging;
+using Microsoft.Extensions.Options;
+
+namespace EnvelopeGenerator.Application.Services;
+
+//TODO: move to DigitalData.Core
+public class GTXSmsSender : ISmsSender
+{
+    private readonly IHttpClientService<GtxMessagingParams> _smsClient;
+
+    private readonly GtxMessagingParams _smsParams;
+
+    private readonly IMapper _mapper;
+
+    public string ServiceProvider { get; }
+
+    public GTXSmsSender(IHttpClientService<GtxMessagingParams> smsClient, IOptions<GtxMessagingParams> smsParamsOptions, IMapper mapper)
+    {
+        _smsClient = smsClient;
+        _smsParams = smsParamsOptions.Value;
+        _mapper = mapper;
+        ServiceProvider = GetType().Name.Replace("Service", string.Empty);
+    }
+
+    public async Task<SmsResponse> SendSmsAsync(string recipient, string message)
+    {
+        return await _smsClient.FetchAsync(queryParams: new Dictionary<string, object?>()
+        {
+            { _smsParams.RecipientQueryParamName, recipient },
+            { _smsParams.MessageQueryParamName, message }
+        })
+        .ThenAsync(res => res.Json<GtxMessagingResponse>())
+        .ThenAsync(_mapper.Map<SmsResponse>);
+    }
+}

EnvelopeGenerator.Application/Services/ReceiverService.cs

@@ -0,0 +1,51 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+using EnvelopeGenerator.Application.DTOs.Receiver;
+using DigitalData.Core.DTO;
+using DigitalData.Core.Abstractions;
+using Microsoft.Extensions.Logging;
+using EnvelopeGenerator.Application.Contracts.Services;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class ReceiverService : CRUDService<IReceiverRepository, ReceiverCreateDto, ReceiverReadDto, ReceiverUpdateDto, Receiver, int>, IReceiverService
+{
+    public ReceiverService(IReceiverRepository repository, IMapper mapper)
+        : base(repository, mapper)
+    {
+    }
+
+    public async Task<DataResult<ReceiverReadDto>> ReadByAsync(string? emailAddress = null, string? signature = null)
+    {
+        var rcv = await _repository.ReadByAsync(emailAddress: emailAddress, signature: signature);
+
+        if (rcv is null)
+            return Result.Fail<ReceiverReadDto>();
+
+        return Result.Success(_mapper.Map<ReceiverReadDto>(rcv));
+    }
+
+    public async Task<Result> DeleteByAsync(string? emailAddress = null, string? signature = null)
+    {
+        var rcv = await _repository.ReadByAsync(emailAddress: emailAddress, signature: signature);
+
+        if (rcv is null)
+            return Result.Fail();
+
+        return await _repository.DeleteAsync(rcv) ? Result.Success() : Result.Fail();
+    }
+
+    public virtual async Task<Result> UpdateAsync<TUpdateDto>(TUpdateDto updateDto) where TUpdateDto : IUnique<int>
+    {
+        var val = await _repository.ReadByIdAsync(updateDto.Id);
+        if (val == null)
+        {
+            return Result.Fail().Notice(LogLevel.Warning, Flag.NotFound, $"{updateDto.Id} is not found in update process of {GetType()} entity.");
+        }
+
+        var entity = _mapper.Map(updateDto, val);
+        return (await _repository.UpdateAsync(entity)) ? Result.Success() : Result.Fail();
+    }
+}

EnvelopeGenerator.Application/Services/UserReceiverService.cs

@@ -0,0 +1,16 @@
+using AutoMapper;
+using DigitalData.Core.Application;
+using EnvelopeGenerator.Application.Contracts.Services;
+using EnvelopeGenerator.Application.DTOs;
+using EnvelopeGenerator.Domain.Entities;
+using EnvelopeGenerator.Application.Contracts.Repositories;
+
+namespace EnvelopeGenerator.Application.Services;
+
+public class UserReceiverService : BasicCRUDService<IUserReceiverRepository, UserReceiverDto, UserReceiver, int>, IUserReceiverService
+{
+    public UserReceiverService(IUserReceiverRepository repository, IMapper mapper)
+        : base(repository, mapper)
+    {
+    }
+}

EnvelopeGenerator.BBTests/EnvelopeGenerator.BBTests.vbproj

@@ -0,0 +1,396 @@
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\packages\EntityFramework.6.4.4\build\EntityFramework.props" Condition="Exists('..\packages\EntityFramework.6.4.4\build\EntityFramework.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <ProductVersion>8.0.30703</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{089D5634-FB6B-42D0-B912-7AA7457044E7}</ProjectGuid>
+    <OutputType>WinExe</OutputType>
+    <RootNamespace>EnvelopeGenerator</RootNamespace>
+    <AssemblyName>EnvelopeGenerator</AssemblyName>
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+    <Compile Include="My Project\Application.Designer.vb">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Application.myapp</DependentUpon>
+      <DesignTime>True</DesignTime>
+    </Compile>
+    <Compile Include="My Project\AssemblyInfo.vb" />
+    <EmbeddedResource Include="frmFieldEditor.resx">
+      <DependentUpon>frmFieldEditor.vb</DependentUpon>
+    </EmbeddedResource>
+    <EmbeddedResource Include="frmFinalizePDF.resx">
+      <DependentUpon>frmFinalizePDF.vb</DependentUpon>
+    </EmbeddedResource>
+    <EmbeddedResource Include="frmReportViewer.resx">
+      <DependentUpon>frmReportViewer.vb</DependentUpon>
+    </EmbeddedResource>
+    <EmbeddedResource Include="My Project\licenses.licx" />
+    <EmbeddedResource Include="My Project\Resources.resx">
+      <Generator>VbMyResourcesResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.vb</LastGenOutput>
+      <CustomToolNamespace>My.Resources</CustomToolNamespace>
+      <SubType>Designer</SubType>
+    </EmbeddedResource>
+    <Compile Include="My Project\Resources.Designer.vb">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+    <None Include="app.config" />
+    <None Include="My Project\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.vb</LastGenOutput>
+    </None>
+    <Compile Include="My Project\Settings.Designer.vb">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+    </Compile>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="My Project\Application.myapp">
+      <Generator>MyApplicationCodeGenerator</Generator>
+      <LastGenOutput>Application.Designer.vb</LastGenOutput>
+    </None>
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\EnvelopeGenerator.Common\EnvelopeGenerator.Common.vbproj">
+      <Project>{6EA0C51F-C2B1-4462-8198-3DE0B32B74F8}</Project>
+      <Name>EnvelopeGenerator.Common</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="GdPicture.NET.14.barcode.1d.reader.64.dll" />
+    <Content Include="GdPicture.NET.14.barcode.1d.reader.dll" />
+    <Content Include="GdPicture.NET.14.barcode.2d.reader.64.dll" />
+    <Content Include="GdPicture.NET.14.barcode.2d.reader.dll" />
+    <Content Include="GdPicture.NET.14.filters.64.dll" />
+    <Content Include="GdPicture.NET.14.filters.dll" />
+    <Content Include="GdPicture.NET.14.image.gdimgplug.64.dll" />
+    <Content Include="GdPicture.NET.14.image.gdimgplug.dll" />
+    <Content Include="GdPicture.NET.14.Imaging.ML.64.dll" />
+    <Content Include="GdPicture.NET.14.Imaging.ML.dll" />
+    <Content Include="GdPicture.NET.14.Imaging.Rendering.Skia.64.dll" />
+    <Content Include="GdPicture.NET.14.Imaging.Rendering.Skia.dll" />
+    <Content Include="GdPicture.NET.14.machine.vision.64.dll" />
+    <Content Include="GdPicture.NET.14.machine.vision.dll" />
+    <Content Include="GdPicture.NET.14.twain.client.64.dll" />
+    <Content Include="GdPicture.NET.14.twain.client.dll" />
+    <Content Include="MailLicense.xml" />
+    <Content Include="README.txt" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.VisualBasic.targets" />
+  <Import Project="..\packages\GdPicture.runtimes.windows.14.3.3\build\net462\GdPicture.runtimes.windows.targets" Condition="Exists('..\packages\GdPicture.runtimes.windows.14.3.3\build\net462\GdPicture.runtimes.windows.targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\packages\GdPicture.runtimes.windows.14.3.3\build\net462\GdPicture.runtimes.windows.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\GdPicture.runtimes.windows.14.3.3\build\net462\GdPicture.runtimes.windows.targets'))" />
+    <Error Condition="!Exists('..\packages\EntityFramework.6.4.4\build\EntityFramework.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\EntityFramework.6.4.4\build\EntityFramework.props'))" />
+    <Error Condition="!Exists('..\packages\EntityFramework.6.4.4\build\EntityFramework.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\EntityFramework.6.4.4\build\EntityFramework.targets'))" />
+  </Target>
+  <Import Project="..\packages\EntityFramework.6.4.4\build\EntityFramework.targets" Condition="Exists('..\packages\EntityFramework.6.4.4\build\EntityFramework.targets')" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it.
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>