Merge pull request #248 from Project-MONAI/release/1.0.4

Release/1.0.4

Author: neildsouth

src/Messaging/Events/ExportRequestEvent.cs

@@ -87,6 +87,13 @@ public class ExportRequestEvent : EventBase
         [JsonPropertyName("error_messages")]
         public List<string> ErrorMessages { get; private set; }
 
+        /// <summary>
+        /// Gets or set the payloadId for external apps sending data back
+        /// </summary>
+        [JsonProperty(PropertyName = "payload_id")]
+        [JsonPropertyName("payload_id")]
+        public string? PayloadId { get; set; }
+
         /// <summary>
         /// A list of data output plug-in type names to be executed by the export services.
         /// Each string must be a fully-qualified type name.