diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index 108e8fe5..6e858833 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -220,7 +220,7 @@ class ShopController extends BaseAuthedController {
             return;
         }
 
-        $secretKey = 'e58f(1dcf22245985c21ff31f2f66ec4a^^TDAFF(Adaf)';
+        $secretKey = OUTAPP_PKEY;
         $nowTime = myself()->_getNowTime();
         $fiatAmount = $goodsMeta['price'];
         $orderId = OrderId::gen();