diff --git a/EnvelopeGenerator.Application/EnvelopeReceivers/Commands/Create/CreateEnvelopeReceiverDtos.cs b/EnvelopeGenerator.Application/EnvelopeReceivers/Commands/Create/CreateEnvelopeReceiverDtos.cs
index 77aa2869..d26354cd 100644
--- a/EnvelopeGenerator.Application/EnvelopeReceivers/Commands/Create/CreateEnvelopeReceiverDtos.cs
+++ b/EnvelopeGenerator.Application/EnvelopeReceivers/Commands/Create/CreateEnvelopeReceiverDtos.cs
@@ -36,14 +36,12 @@ public record ReceiverGetOrCreateCommand([Required] IEnumerable<Signature> Signa
 /// <summary>
 /// DTO zum Erstellen eines Dokuments.
 /// </summary>
-/// <param name="DataAsByte">
-/// Die Dokumentdaten im Byte-Array-Format. Wird verwendet, wenn das Dokument als Roh-Binärdaten bereitgestellt wird.
-/// </param>
-public record DocumentCreateCommand(byte[]? DataAsByte = null)
+public record DocumentCreateCommand()
 {
     /// <summary>
     /// Die Dokumentdaten im Base64-String-Format. Wird verwendet, wenn das Dokument als Base64-codierter String bereitgestellt wird.
     /// </summary>
-    public string? DataAsBase64 { get; set; }
+    [Required]
+    public required string DataAsBase64 { get; init; }
 };
 #endregion
\ No newline at end of file
diff --git a/EnvelopeGenerator.Application/SQL/EnvelopeReceiverAddReadSQL.cs b/EnvelopeGenerator.Application/SQL/EnvelopeReceiverAddReadSQL.cs
index b389a4c4..c065accd 100644
--- a/EnvelopeGenerator.Application/SQL/EnvelopeReceiverAddReadSQL.cs
+++ b/EnvelopeGenerator.Application/SQL/EnvelopeReceiverAddReadSQL.cs
@@ -13,15 +13,14 @@ public class EnvelopeReceiverAddReadSQL : ISQL<Envelope>
     /// 
     /// </summary>
     public string Raw => @"
-		USE [DD_ECM]
 		DECLARE	@OUT_RECEIVER_ID int
 
 		EXEC	[dbo].[PRSIG_API_CREATE_RECEIVER]
-				@ENV_UID = @ENV_UID,
-				@EMAIL_ADRESS = @EMAIL_ADRESS,
-				@SALUTATION = @SALUTATION,
-				@PHONE = @PHONE,
-				@OUT_RECEIVER_ID = @OUT_RECEIVER_ID OUTPUT
+				@ENV_UID,
+				@EMAIL_ADRESS,
+				@SALUTATION,
+				@PHONE,
+				@OUT_RECEIVER_ID OUTPUT
 
 		SELECT TOP(1) *
 		FROM TBSIG_ENVELOPE_RECEIVER
diff --git a/EnvelopeGenerator.GeneratorAPI/Controllers/EnvelopeReceiverController.cs b/EnvelopeGenerator.GeneratorAPI/Controllers/EnvelopeReceiverController.cs
index b007e6d6..62127f4a 100644
--- a/EnvelopeGenerator.GeneratorAPI/Controllers/EnvelopeReceiverController.cs
+++ b/EnvelopeGenerator.GeneratorAPI/Controllers/EnvelopeReceiverController.cs
@@ -221,16 +221,6 @@ public class EnvelopeReceiverController : ControllerBase
             #endregion
 
             #region Add document
-            if(request.Document.DataAsBase64 is null)
-                if (request.Document.DataAsByte is null)
-                    return BadRequest("No document data is found");
-                else
-                    request.Document.DataAsBase64 = Convert.ToBase64String(request.Document.DataAsByte);
-            else if (request.Document.DataAsByte is not null)
-                return BadRequest("Document data cannot be assigned as both byte data and base64 string.");
-            else if (!IsBase64String(request.Document.DataAsBase64))
-                return BadRequest("Document data is not a base64 string");
-
             var document = await _documentExecutor.CreateDocumentAsync(request.Document.DataAsBase64, envelope.Uuid, cancel);
 
             if(document is null)
@@ -279,8 +269,6 @@ public class EnvelopeReceiverController : ControllerBase
             #endregion
 
             #region Create history
-            string connectionString = "Server=YOUR_SERVER;Database=YOUR_DATABASE;Trusted_Connection=True;";
-
             string sql_hist = @"
                 USE [DD_ECM]
 
@@ -294,7 +282,7 @@ public class EnvelopeReceiverController : ControllerBase
 
                 SELECT @OUT_SUCCESS as [@OUT_SUCCESS];";
 
-            using (SqlConnection conn = new(connectionString))
+            using (SqlConnection conn = new(_cnnStr))
             {
                 conn.Open();