美团，饿百回调添加系统级参数

platformapi/mtwmapi/callback.go

@@ -60,7 +60,12 @@ type CallbackRefundInfo struct {
 }
 
 type CallbackMsg struct {
-	Cmd      string
+	Cmd string
+
+	Timestamp int64  `json:"timestamp"`
+	AppID     string `json:"app_id"`
+	Sig       string `json:"sig"`
+
 	FormData url.Values
 	Data     interface{}
 }
@@ -110,6 +115,10 @@ func (a *API) GetCallbackMsg(request *http.Request) (msg *CallbackMsg, callbackR
 					}
 					msg.FormData.Set(k, v.(string))
 				}
+				msg.Timestamp = utils.Str2Int64(msg.FormData.Get("timestamp"))
+				msg.Sig = dataSign.(string)
+				msg.AppID = msg.FormData.Get("app_id")
+
 				if msg.Cmd == MsgTypeOrderRefund || msg.Cmd == MsgTypeOrderPartialRefund {
 					var refundData *CallbackRefundInfo
 					if err = utils.Map2StructByJson(data, &refundData, true); err == nil {