fixes

Author: StuartFerguson

CallbackHandler/Controllers/CallbackController.cs

@@ -91,7 +91,7 @@ public async Task<ActionResult<Result<CallbackMessage>>> GetCallback([FromRoute
         /// <summary>
         /// The controller name
         /// </summary>
-        public const String ControllerName = "callbacks";
+        private const String ControllerName = "callbacks";
 
         /// <summary>
         /// The controller route