退货&退款

@@ -104,7 +104,7 @@ class Refund
         ksort($Parameters);
         $String = $this->formatBizQueryParaMap($Parameters, false);
         //签名步骤二：在string后加入KEY
-        $String = $String . "&key=" . $this->key;
+        $String = $String . "&key=" . config('Key');
         //签名步骤三：MD5加密
         $String = md5($String);
         //签名步骤四：所有字符转为大写