over amount

@@ -163,7 +163,9 @@ exports.receiveCoupons = (req, res, next) => {
         openId: openId
     }).then((result) => {
         if (result.code === 200) {
-            result.data.goUrl = result.data.goUrl + '?sign=' + md5(result.data.couponAmount + secretKey);
+            result.data.goUrl = result.data.goUrl +
+            '?amount=' + result.data.couponAmount +
+            '&sign=' + md5(result.data.couponAmount + secretKey);
         }
         res.json(result);
     }).catch(next);