Handle events.

Calculate targetn.

FarmmapsApi/Models/EventMessage.cs

@@ -0,0 +1,12 @@
+using System.Collections.Generic;
+using Newtonsoft.Json.Linq;
+
+namespace FarmmapsApi.Models
+{
+    public class EventMessage
+    {
+        public string EventType { get; set; }
+        public string ItemCode { get; set; }
+        public Dictionary<string, string> Attributes { get; set; }
+    }
+}