Update API

LineMessaging/CommonData/LineUsage.cs

@@ -0,0 +1,16 @@
+using Newtonsoft.Json;
+
+namespace LineMessaging
+{
+    public class LineUsage
+    {
+        [JsonProperty("totalUsage")]
+        public int TotalUsage { get; set; }
+    }
+    public class LineGroupProfile
+    {
+        [JsonProperty("groupName")]
+        public string GroupName { get; set; }
+    }
+    
+}