diff --git a/.gitignore b/.gitignore
index f32a2bf..69bbf6e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ artifacts/
 **/bin/
 **/obj/
 **/.vs/
+**/*.lscache
diff --git a/HOWTO_08_pay_sign_issue_csharp/Program.cs b/HOWTO_08_pay_sign_issue_csharp/Program.cs
index 086d697..c48a700 100644
--- a/HOWTO_08_pay_sign_issue_csharp/Program.cs
+++ b/HOWTO_08_pay_sign_issue_csharp/Program.cs
@@ -154,7 +154,7 @@ static async Task Main(string[] args)
                                 if (isDelivered)
                                 {
                                     Logger.LogInfo("Receipt has been delivered successfully.");
-                                    Logger.LogDebug($"Delivery details - {deliveryDateils.state}: {deliveryDateils.message}");
+                                    Logger.LogDebug($"Delivery details - {deliveryDateils?.Message}");
                                 }
                                 else
                                 {
diff --git a/libPosSystemAPI/DTO/IssueDeliveredResponse.cs b/libPosSystemAPI/DTO/IssueDeliveredResponse.cs
index fdaab4e..44c6da0 100644
--- a/libPosSystemAPI/DTO/IssueDeliveredResponse.cs
+++ b/libPosSystemAPI/DTO/IssueDeliveredResponse.cs
@@ -1,11 +1,24 @@
-namespace fiskaltrust.DevKit.POSSystemAPI.lib.DTO
+using System.Collections.Generic;
+using System.Text.Json.Serialization;
+
+namespace fiskaltrust.DevKit.POSSystemAPI.lib.DTO
 {
     /// <summary>
     /// Provides some details about how the delivery was executed for debug purpose.
     /// </summary>
     public class IssueDeliveredResponse
     {
-        public string state { get; set; } = string.Empty;
-        public string message { get; set; } = string.Empty;
-    }
+        /// <summary>
+        /// A message describing how the delivery was executed.
+        /// </summary>
+        /// <example>""Receipt was printed at 01/30/2026 00:03:57. DeliveryMethod: customeraccepted"</example>
+        [JsonPropertyName("message")]
+        public string Message { get; set; } = string.Empty;
+
+        /// <summary>
+        /// Additional arbitrary properties that will be serialized as top-level JSON fields
+        /// alongside the known properties.
+        /// </summary>
+        [JsonExtensionData]
+        public Dictionary<string, object?>? AdditionalProperties { get; set; }    }
 }