diff --git a/app/controller/Wechat.php b/app/controller/Wechat.php
index be71e51..0b4049d 100644
--- a/app/controller/Wechat.php
+++ b/app/controller/Wechat.php
@@ -115,7 +115,7 @@ class Wechat
             'trade_type'   => 'JSAPI',
             'openid'       => $user->openid,
         ]);
-        $prepayId = $unify->prepay_id;
+        $prepayId = $unify['prepay_id'];
         $jssdk    = $payment->jssdk->bridgeConfig($prepayId);
         return View::fetch('', ['jssdk' => $jssdk]);
     }