diff --git a/Test/open.php b/Test/open.php
new file mode 100644
index 0000000..5c6a0fe
--- /dev/null
+++ b/Test/open.php
@@ -0,0 +1,54 @@
+<?php
+
+// +----------------------------------------------------------------------
+// | WeChatDeveloper
+// +----------------------------------------------------------------------
+// | 版权所有 2014~2018 广州楚才信息科技有限公司 [ http://www.cuci.cc ]
+// +----------------------------------------------------------------------
+// | 官方网站: http://think.ctolog.com
+// +----------------------------------------------------------------------
+// | 开源协议 ( https://mit-license.org )
+// +----------------------------------------------------------------------
+// | github开源项目：https://github.com/zoujingli/WeChatDeveloper
+// +----------------------------------------------------------------------
+
+try {
+
+    // 1. 手动加载入口文件
+    include "../include.php";
+
+    $config = [
+        'component_appid'          => 'test',
+        'component_token'          => 'test',
+        'component_appsecret'      => '71308e96a204296c57d7cd4b21b883e8',
+        'component_encodingaeskey' => 'BJIUzE0gqlWy0GxfPp4J1oPTBmOrNDIGPNav1YFH5Z5',
+        // 配置商户支付参数
+        'mch_id'                   => "1332187001",
+        'mch_key'                  => '11bd3d66d85f322a1e803cb587d18c3f',
+        // 配置商户支付双向证书目录
+        'ssl_key'                  => '',
+        'ssl_cer'                  => '',
+
+    ];
+    // 开放平台获取授权公众号 AccessToken 处理
+    $config['GetAccessTokenCallback'] = function ($authorizer_appid) use ($config) {
+        $open = new \WeChat\Open($config);
+        $authorizer_refresh_token = ''; // 从数据库去找吧，在授权绑定的时候获取到了
+        $result = $open->refreshAccessToken($authorizer_appid, $authorizer_refresh_token);
+        if (empty($result['authorizer_access_token'])) {
+            throw new \WeChat\Exceptions\InvalidResponseException($result['errmsg'], '0');
+        }
+        $data = [
+            'authorizer_access_token'  => $result['authorizer_access_token'],
+            'authorizer_refresh_token' => $result['authorizer_refresh_token'],
+        ];
+        // 需要把$data记录到数据库
+        return $result['authorizer_access_token'];
+    };
+    // 使用第三方服务创建接口实例
+    $open = new \WeChat\Open($config);
+    $wechat = $open->instance('授权公众号APPID', 'User');
+} catch (Exception $e) {
+    // 出错啦，处理下吧
+    echo $e->getMessage() . PHP_EOL;
+}
\ No newline at end of file
diff --git a/WeChat/Contracts/WeChat.php b/WeChat/Contracts/WeChat.php
index d307dfc..d6b269b 100644
--- a/WeChat/Contracts/WeChat.php
+++ b/WeChat/Contracts/WeChat.php
@@ -48,6 +48,12 @@ class WeChat
      */
     private $isTry = false;
 
+    /**
+     * 注册代替函数
+     * @var string
+     */
+    private $GetAccessTokenCallback;
+
     /**
      * Wechat constructor.
      * @param array $options
@@ -60,6 +66,9 @@ class WeChat
         if (empty($options['appsecret'])) {
             throw new InvalidArgumentException("Missing Config -- [appsecret]");
         }
+        if (isset($options['GetAccessTokenCallback']) && is_callable($options['GetAccessTokenCallback'])) {
+            $this->GetAccessTokenCallback = $options['GetAccessTokenCallback'];
+        }
         $this->config = new DataArray($options);
     }
 
@@ -69,7 +78,7 @@ class WeChat
      * @throws \WeChat\Exceptions\InvalidResponseException
      * @throws \WeChat\Exceptions\LocalCacheException
      */
-    public function getAccesstoken()
+    public function getAccessToken()
     {
         if (!empty($this->access_token)) {
             return $this->access_token;
@@ -79,11 +88,19 @@ class WeChat
         if (!empty($this->access_token)) {
             return $this->access_token;
         }
+        // 处理开放平台授权公众号获取AccessToken
+        if (!empty($this->GetAccessTokenCallback) && is_callable($this->GetAccessTokenCallback)) {
+            $this->access_token = call_user_func_array($this->GetAccessTokenCallback, [$this->config->get('appid'), $this]);
+            if (!empty($this->access_token)) {
+                Tools::setCache($cache, $this->access_token, 7000);
+            }
+            return $this->access_token;
+        }
         list($appid, $secret) = [$this->config->get('appid'), $this->config->get('appsecret')];
         $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={$appid}&secret={$secret}";
         $result = Tools::json2arr(Tools::get($url));
         if (!empty($result['access_token'])) {
-            Tools::setCache($cache, $result['access_token'], 6000);
+            Tools::setCache($cache, $result['access_token'], 7000);
         }
         return $result['access_token'];
     }
@@ -149,7 +166,7 @@ class WeChat
     {
         $this->currentMethod = ['method' => $method, 'arguments' => $arguments];
         if (empty($this->access_token)) {
-            $this->access_token = $this->getAccesstoken();
+            $this->access_token = $this->getAccessToken();
         }
         return $url = str_replace('ACCESS_TOKEN', $this->access_token, $url);
     }
diff --git a/WeChat/Open.php b/WeChat/Open.php
index b5f48de..18aa6a5 100644
--- a/WeChat/Open.php
+++ b/WeChat/Open.php
@@ -253,4 +253,21 @@ class Open extends WeChat
         return $result !== false ? $result : false;
     }
 
+    /**
+     * 创建需要的接口实例
+     * @param string $type 需要加载的接口实例名称
+     * @param string $authorizer_appid 授权公众号的appid
+     * @return Card|Custom|Media|Menu|Oauth|Pay|Product|Qrcode|Receive|Scan|Script|Shake|Tags|Template|User|Wifi
+     */
+    public function instance($type, $authorizer_appid)
+    {
+        $className = 'WeChat\\' . ucfirst(strtolower($type));
+        $config = $this->config->get();
+        $config['appid'] = $authorizer_appid;
+        $config['token'] = $this->config->get('component_token');
+        $config['appsecret'] = $this->config->get('component_appsecret');
+        $config['encodingaeskey'] = $this->config->get('component_encodingaeskey');
+        return new $className($config);
+    }
+
 }
\ No newline at end of file