diff --git a/platformapi/mtwmapi/mtwmapi.go b/platformapi/mtwmapi/mtwmapi.go
index aff63f69..b88a9197 100644
--- a/platformapi/mtwmapi/mtwmapi.go
+++ b/platformapi/mtwmapi/mtwmapi.go
@@ -31,6 +31,7 @@ const (
 	KeyImgName     = "img_name"
 	KeyImgData     = "img_data"
 	KeyOrderID     = "order_id"
+	KeyAppID       = "app_id"
 )
 
 const (