First commit that builds.

code/MessengerBroker/Model/Http/Sync.cs

@@ -0,0 +1,42 @@
+namespace MessengerBroker.Model.Http
+{
+    public class Sync
+    {
+        public class SyncRequest
+        {
+            public Guid BrokerId { get; set; }
+
+            public DateTime SinceUtc { get; set; }
+        }
+
+        public class SyncResponse
+        {
+            public Message[] Messages { get; set; }
+
+            public class Message
+            {
+                public Guid Id { get; set; }
+
+                public DateTime CreatedUtc { get; set; }
+
+                public Guid? From { get; set; }
+
+                public Guid? To { get; set; }
+
+                public bool IsDelivered { get; set; }
+
+                public bool IsAcknowledged { get; set; }
+
+                public string PayloadId { get; set; }
+
+                public string PayloadType { get; set; }
+
+                public string Payload { get; set; }
+
+                public DateTime? PayloadTimestamp { get; set; }
+
+                public int? PayloadLifespanInSeconds { get; set; }
+            }
+        }
+    }
+}

code/MessengerBroker/Model/Http/Users.cs

@@ -0,0 +1,36 @@
+namespace MessengerBroker.Model.Http
+{
+    public class Users
+    {
+        public class UsersResponse
+        {
+            public User[] Users { get; set; }
+
+            public UserRoute[] UserRoutes { get; set; }
+
+            public class User
+            {
+                public Guid Id { get; set; }
+
+                public Guid ApiKey { get; set; }
+
+                public string Name { get; set; }
+
+                public bool IsEnabled { get; set; }
+
+                public bool CanSend { get; set; }
+
+                public bool CanReceive { get; set; }
+            }
+
+            public class UserRoute
+            {
+                public Guid Id { get; set; }
+
+                public Guid FromId { get; set; }
+
+                public Guid ToId { get; set; }
+            }
+        }
+    }
+}