Fixed issues related to comments.

src/Infrastructure/BotSharp.Abstraction/Messaging/Models/RichContent/QuickReplyElement.cs

@@ -9,6 +9,7 @@ namespace BotSharp.Abstraction.Messaging.Models.RichContent
         public string? Payload { get; set; }
         [JsonPropertyName("image_url")]
         public string? ImageUrl { get; set; }
+        [JsonPropertyName("postback_url")]
         public string? PostBackUrl { get; set; }
     }
 }

src/Infrastructure/BotSharp.Abstraction/Messaging/Models/RichContent/Recipient.cs

@@ -3,6 +3,6 @@ namespace BotSharp.Abstraction.Messaging.Models.RichContent
 {
     public class Recipient
     {
-        public string? Id { get; set; }
+        public string Id { get; set; } = string.Empty;
     }
 }

src/Infrastructure/BotSharp.Abstraction/Messaging/Models/RichContent/RichContent.cs

@@ -2,12 +2,12 @@ namespace BotSharp.Abstraction.Messaging.Models.RichContent
 {
     public class RichContent<T>
     {
-        public Recipient? Recipient { get; set; }
+        public Recipient Recipient { get; set; } = new Recipient();
         /// <summary>
         /// RESPONSE
         /// </summary>
         [JsonPropertyName("messaging_type")]
-        public string? MessageingType { get; set; }
+        public string? MessagingType { get; set; }
         public T Message { get; set; }
     }
 }

src/Infrastructure/BotSharp.Abstraction/Messaging/Models/RichContent/SenderActionMessage.cs

@@ -1,7 +1,7 @@
 
 namespace BotSharp.Abstraction.Messaging.Models.RichContent
 {
-    public class SenderActionModel
+    public class SenderActionMessage
     {
         /* 
          * Requests to display sender action should only include the sender_action parameter and the recipient object.

src/Infrastructure/BotSharp.Abstraction/Messaging/Models/RichContent/Template/ButtonTemplate.cs

@@ -10,8 +10,8 @@ namespace BotSharp.Abstraction.Messaging.Models.RichContent.Template
 
     public class ButtonElement
     {
-        public string? Type { get; set; }
+        public string Type { get; set; } = string.Empty;
         public string? Url { get; set; }
-        public string? Title { get; set; }
+        public string Title { get; set; } = string.Empty;
     }
 }

src/Infrastructure/BotSharp.Abstraction/Messaging/Models/RichContent/Template/CommonTemplate.cs

@@ -3,6 +3,7 @@ namespace BotSharp.Abstraction.Messaging.Models.RichContent.Template
 {
     public class CommonTemplate<T>
     {
+        [JsonPropertyName("template_type")]
         public string TemplateType { get; set; } = string.Empty;
         public T Elements { get; set; }
     }

src/Infrastructure/BotSharp.Abstraction/Messaging/Models/RichContent/TextMessage.cs

@@ -3,6 +3,6 @@ namespace BotSharp.Abstraction.Messaging.Models.RichContent
 {
     public class TextMessage
     {
-        public string? Text { get; set; }
+        public string Text { get; set; } = string.Empty;
     }
 }