[update] wechat pay libs

src/libs/pay.js

@@ -77,12 +77,12 @@ const WeChat = {
   pay: function(params, callback) {
     if (!wechat_installed) return;
     Wechat.sendPaymentRequest(
-      ret.data,
-      function() {
-        callback(true, ret.data);
+      params,
+      function(data) {
+        callback(true, data);
       },
-      function(reason) {
-        callback(false, reason);
+      function(data) {
+        callback(false, data);
       }
     );
   }