Made updated a bunch of IDs to long(Int64) over int(Int32).

.gitignore

@@ -3,3 +3,4 @@ bin
 obj
 *.userprefs
 *.suo
+.vs

MailJetClient/Response/Data/MessageData.cs

@@ -8,18 +8,19 @@ public class MessageData : DataItem
         public DateTime ArrivedAt { get; set; }
         public int AttachmentCount { get; set; }
         public int AttemptCount { get; set; }
-        public int CampaignID { get; set; }
-        public int ContactID { get; set; }
+        public long CampaignID { get; set; }
+        public long ContactID { get; set; }
         public long Delay { get; set; }
         public int DestinationID { get; set; }
         public int FilterTime { get; set; }
-        public int FromID { get; set; }
+        public long FromID { get; set; }
         public bool IsClickTracked { get; set; }
         public bool IsHtmlPartIncluded { get; set; }
         public bool IsOpenTracked { get; set; }
         public bool IsUnsubTracked { get; set; }
         public long MessageSize { get; set; }
-        public int SpamassassinScore { get; set; }
+        public decimal SpamassassinScore { get; set; }
+        public long StateID { get; set; }
         public bool StatePermanent { get; set; }
         public MessageStatus Status { get; set; }
     }