diff --git a/WeChat/Contracts/Config.php b/WeChat/Contracts/DataArray.php
similarity index 98%
rename from WeChat/Contracts/Config.php
rename to WeChat/Contracts/DataArray.php
index 7b9fdd1..2ec216b 100644
--- a/WeChat/Contracts/Config.php
+++ b/WeChat/Contracts/DataArray.php
@@ -20,7 +20,7 @@ use ArrayAccess;
  * Class Config
  * @package Wechat
  */
-class Config implements ArrayAccess
+class DataArray implements ArrayAccess
 {
 
     /**
diff --git a/WeChat/Contracts/Request.php b/WeChat/Contracts/Request.php
index 7149d87..fc1d408 100644
--- a/WeChat/Contracts/Request.php
+++ b/WeChat/Contracts/Request.php
@@ -45,19 +45,19 @@ class Request
 
     /**
      * 当前公众号配置对象
-     * @var Config
+     * @var DataArray
      */
     protected $config;
 
     /**
      * 公众号的推送请求参数
-     * @var Config
+     * @var DataArray
      */
     protected $params;
 
     /**
      * 公众号推送内容对象
-     * @var Config
+     * @var DataArray
      */
     protected $receive;
 
@@ -84,8 +84,8 @@ class Request
             throw new InvalidArgumentException("Missing Config -- [token]");
         }
         // 参数初始化
-        $this->config = new Config($options);
-        $this->params = new Config($_REQUEST);
+        $this->config = new DataArray($options);
+        $this->params = new DataArray($_REQUEST);
         $this->appid = $this->config->get('appid');
         // 推送消息处理
         if ($_SERVER['REQUEST_METHOD'] == "POST") {
@@ -106,7 +106,7 @@ class Request
                 }
                 list($this->postxml, $this->appid) = [$array[1], $array[2]];
             }
-            $this->receive = new Config(Tools::xml2arr($this->postxml));
+            $this->receive = new DataArray(Tools::xml2arr($this->postxml));
         } elseif ($_SERVER['REQUEST_METHOD'] == "GET" && $this->checkSignature()) {
             @ob_clean();
             exit($this->params->get('echostr'));
diff --git a/WeChat/Contracts/Tools.php b/WeChat/Contracts/Tools.php
index 7a5b047..4423894 100644
--- a/WeChat/Contracts/Tools.php
+++ b/WeChat/Contracts/Tools.php
@@ -66,22 +66,6 @@ class Tools
         return $method(join('&', $params));
     }
 
-    /**
-     * 生成支付签名
-     * @param array $data
-     * @param string $mchKey 商户密钥
-     * @return string
-     */
-    public static function getPaySign(array $data, $mchKey)
-    {
-        ksort($data);
-        $string = "";
-        foreach ($data as $key => $value) {
-            $string .= "{$key}={$value}&";
-        }
-        return strtoupper(hash_hmac('SHA256', "{$string}key={$mchKey}", $mchKey));
-    }
-
     /**
      * 根据文件后缀获取文件MINE
      * @param array $ext 文件后缀
@@ -343,6 +327,6 @@ class Tools
         }
         self::$cache_path = rtrim(self::$cache_path, '/\\') . DIRECTORY_SEPARATOR;
         file_exists(self::$cache_path) || mkdir(self::$cache_path, 0755, true);
-        return self::$cache_path . md5($name);
+        return self::$cache_path . $name;
     }
 }
\ No newline at end of file
diff --git a/WeChat/Contracts/WeChat.php b/WeChat/Contracts/WeChat.php
index 38c13b5..4a66d85 100644
--- a/WeChat/Contracts/WeChat.php
+++ b/WeChat/Contracts/WeChat.php
@@ -26,7 +26,7 @@ class WeChat
 
     /**
      * 当前微信配置
-     * @var Config
+     * @var DataArray
      */
     public $config;
 
@@ -60,7 +60,7 @@ class WeChat
         if (empty($options['appsecret'])) {
             throw new InvalidArgumentException("Missing Config -- [appsecret]");
         }
-        $this->config = new Config($options);
+        $this->config = new DataArray($options);
     }
 
     /**
@@ -98,7 +98,6 @@ class WeChat
         return Tools::delCache($this->config->get('appid') . '_accesstoken');
     }
 
-
     /**
      * 以GET获取接口数据并转为数组
      * @param string $url 接口地址
diff --git a/WeChat/Pay.php b/WeChat/Pay.php
index 78aa375..e86940b 100644
--- a/WeChat/Pay.php
+++ b/WeChat/Pay.php
@@ -14,7 +14,7 @@
 
 namespace WeChat;
 
-use WeChat\Contracts\Config;
+use WeChat\Contracts\DataArray;
 use WeChat\Contracts\Tools;
 use WeChat\Exceptions\InvalidArgumentException;
 use WeChat\Exceptions\InvalidResponseException;
@@ -27,17 +27,18 @@ use WeChat\Exceptions\InvalidResponseException;
 class Pay
 {
 
+    /**
+     * 商户配置
+     * @var DataArray
+     */
+    protected $config;
+
     /**
      * 当前请求数据
-     * @var Config
+     * @var DataArray
      */
     protected $params;
 
-    /**
-     * 商户配置
-     * @var Config
-     */
-    protected $config;
 
     /**
      * WeChat constructor.
@@ -50,8 +51,8 @@ class Pay
                 throw new InvalidArgumentException("Missing Config -- [{$key}]", '0');
             }
         }
-        $this->config = new Config($options);
-        $this->params = new Config([
+        $this->config = new DataArray($options);
+        $this->params = new DataArray([
             'appid'     => $this->config->get('appid'),
             'mch_id'    => $this->config->get('mch_id'),
             'nonce_str' => Tools::createNoncestr(),
@@ -85,7 +86,7 @@ class Pay
      * @param string $out_trade_no 商户订单号
      * @return array
      */
-    public function close($out_trade_no)
+    public function closeOrder($out_trade_no)
     {
         $url = 'https://api.mch.weixin.qq.com/pay/closeorder';
         return $this->callPostApi($url, ['out_trade_no' => $out_trade_no]);
@@ -178,13 +179,28 @@ class Pay
     {
         $data = Tools::xml2arr(file_get_contents('php://input'));
         if (!empty($data['sign'])) {
-            if (Tools::getPaySign($data, $this->config->get('mch_key')) === $data['sign']) {
+            if ($this->getPaySign($data) === $data['sign']) {
                 return $data;
             }
         }
         throw new InvalidResponseException('Invalid Notify.', '0');
     }
 
+    /**
+     * 生成支付签名
+     * @param array $data
+     * @return string
+     */
+    public function getPaySign(array $data)
+    {
+        ksort($data);
+        list($key, $str) = [$this->config->get('mch_key'), ''];
+        foreach ($data as $key => $value) {
+            $str .= "{$key}={$value}&";
+        }
+        return strtoupper(hash_hmac('SHA256', "{$str}key={$key}", $key));
+    }
+
     /**
      * 以Post请求接口
      * @param string $url 请求
@@ -206,7 +222,7 @@ class Pay
         }
         $params = $this->params->merge($data);
         $params['sign_type'] = 'HMAC-SHA256';
-        $params['sign'] = Tools::getPaySign($params, $this->config->get('mch_key'));
+        $params['sign'] = $this->getPaySign($params);
         return Tools::xml2arr(Tools::post($url, Tools::arr2xml($params), $option));
     }
 }
\ No newline at end of file