diff --git a/src/Kernel/Events/EventHandlerInterface.php b/src/Kernel/Events/EventHandlerInterface.php
deleted file mode 100644
index 3b063e2..0000000
--- a/src/Kernel/Events/EventHandlerInterface.php
+++ /dev/null
@@ -1,25 +0,0 @@
-<?php
-
-/*
- * This file is part of the overtrue/wechat.
- *
- * (c) overtrue <i@overtrue.me>
- *
- * This source file is subject to the MIT license that is bundled
- * with this source code in the file LICENSE.
- */
-
-namespace EasyAlipay\Kernel\Contracts;
-
-/**
- * Interface EventHandlerInterface.
- *
- * @author mingyoung <mingyoungcheung@gmail.com>
- */
-interface EventHandlerInterface
-{
-    /**
-     * @param mixed $payload
-     */
-    public function handle($payload = null);
-}
diff --git a/src/Kernel/Helpers.php b/src/Kernel/Helpers.php
index f297b33..34c66b9 100644
--- a/src/Kernel/Helpers.php
+++ b/src/Kernel/Helpers.php
@@ -33,8 +33,7 @@ function decrypt($str, $screct_key)
     $screct_key = base64_decode($screct_key);
     $iv_size = openssl_cipher_iv_length('AES-128-CBC');
     $iv = str_repeat("\0", $iv_size);
-    $decrypt_str = openssl_decrypt($str,"AES-128-CBC",$screct_key,OPENSSL_RAW_DATA,$iv);
-    return $decrypt_str;
+    return openssl_decrypt($str,"AES-128-CBC",$screct_key,OPENSSL_RAW_DATA,$iv);
 }
 
 /**
diff --git a/src/Kernel/Traits/SingData.php b/src/Kernel/Traits/SingData.php
index d9b57b6..6f30d40 100644
--- a/src/Kernel/Traits/SingData.php
+++ b/src/Kernel/Traits/SingData.php
@@ -179,42 +179,38 @@ trait SingData
 
     /**
      * 生成应用证书SN.
-     * @param $certPath
+     * @param $cert_path
      * @return string
      * @throws \Exception
      */
-    public function getCertSN($certPath): string
+    public function getCertSN($cert_path): string
     {
-        if (!is_file($certPath)) {
+        if (!is_file($cert_path)) {
             throw new \Exception('unknown certPath -- [getCertSN]');
         }
-        $x509data = file_get_contents($certPath);
+        $x509data = file_get_contents($cert_path);
         if (false === $x509data) {
             throw new \Exception('Alipay CertSN Error -- [getCertSN]');
         }
         openssl_x509_read($x509data);
-        $certdata = openssl_x509_parse($x509data);
-        if (empty($certdata)) {
+        $cert_data = openssl_x509_parse($x509data);
+        if (empty($cert_data)) {
             throw new \Exception('Alipay openssl_x509_parse Error -- [getCertSN]');
         }
         $issuer_arr = [];
-        foreach ($certdata['issuer'] as $key => $val) {
+        foreach ($cert_data['issuer'] as $key => $val) {
             $issuer_arr[] = $key.'='.$val;
         }
         $issuer = implode(',', array_reverse($issuer_arr));
 
-        return md5($issuer.$certdata['serialNumber']);
+        return md5($issuer. $cert_data['serialNumber']);
     }
 
     /**
      * 生成支付宝根证书SN.
      *
-     * @author 大冰 https://sbing.vip/archives/2019-new-alipay-php-docking.html
-     *
      * @param $certPath
-     *
      * @return string
-     *
      * @throws /Exception
      */
     public function getRootCertSN($certPath)
@@ -255,10 +251,7 @@ trait SingData
     /**
      * 0x转高精度数字.
      *
-     * @author 大冰 https://sbing.vip/archives/2019-new-alipay-php-docking.html
-     *
      * @param $hex
-     *
      * @return int|string
      */
     private static function bchexdec($hex)
diff --git a/src/Payment/Notify/Handler.php b/src/Payment/Notify/Handler.php
index ac02783..51e65d1 100644
--- a/src/Payment/Notify/Handler.php
+++ b/src/Payment/Notify/Handler.php
@@ -122,7 +122,7 @@ abstract class Handler
         }
 
         try {
-            $message = json_decode(strval($this->app['request']->getContent()), true);
+            parse_str($this->app['request']->getContent(), $message);
         } catch (\Throwable $e) {
             throw new Exception('Invalid request: ' . $e->getMessage(), 400);
         }