Renaming serializied property name

Author: david-schrenker

src/SocketLabs/InjectionApi/Core/InjectionRequestFactory.cs

@@ -93,7 +93,7 @@ internal virtual MessageJson GenerateBaseMessageJson(IMessageBase message)
                 CustomHeaders = PopulateCustomHeaders(message.CustomHeaders),
                 From = new AddressJson(message.From.Email, message.From.FriendlyName),
                 Attachments = PopulateList(message.Attachments),
-                Metadata = PopulateMetadata(message.Metadata),
+                Meta = PopulateMetadata(message.Metadata),
                 Tags = PopulateTags(message.Tags)
             };
 

src/SocketLabs/InjectionApi/Core/Serialization/MessageJson.cs

@@ -19,7 +19,7 @@ public MessageJson()
             Bcc = new List<AddressJson>();
             MergeData = new MergeDataJson();
             Attachments = new List<AttachmentJson>();
-            Metadata = new List<MetadataHeaderJson>();
+            Meta = new List<MetadataHeaderJson>();
             Tags = new List<string>();
         }
 
@@ -107,7 +107,7 @@ public MessageJson()
         /// <summary>
         /// A list of metadata headers added to the message.
         /// </summary>
-        public List<MetadataHeaderJson> Metadata { get; set; }
+        public List<MetadataHeaderJson> Meta { get; set; }
 
         /// <summary>
         /// A list of tag headers added to the message.