diff --git a/WeChat/Contracts/BasicAliPay.php b/WeChat/Contracts/BasicAliPay.php
index 712893e..d50f1cd 100644
--- a/WeChat/Contracts/BasicAliPay.php
+++ b/WeChat/Contracts/BasicAliPay.php
@@ -230,7 +230,6 @@ abstract class BasicAliPay
      */
     protected function trimCert($sign)
     {
-        // if (file_exists($sign)) $sign = file_get_contents($sign);
         return preg_replace(['/\s+/', '/-{5}.*?-{5}/'], '', $sign);
     }