diff --git a/src/Base/Oauth/Client.php b/src/Base/Oauth/Client.php
index 4b51099..77c29ce 100755
--- a/src/Base/Oauth/Client.php
+++ b/src/Base/Oauth/Client.php
@@ -5,6 +5,8 @@ namespace EasyAlipay\Base\Oauth;
 use EasyAlipay\Base\Model\AlipayUserInfoShareReqyest;
 use EasyAlipay\Kernel\AppClient;
 use EasyAlipay\Base\Model\AlipaySystemOauthTokenRequest;
+use EasyAlipay\Kernel\Exceptions\InvalidSignException;
+use function EasyAlipay\Kernel\decrypt;
 
 class Client extends AppClient
 {
@@ -47,8 +49,13 @@ class Client extends AppClient
         return ($this->execute($request));
     }
 
-    public function decryptData()
+    /**
+     * @param $content
+     * @return false|string
+     */
+    public function decryptData($content)
     {
-        
+        $res = decrypt($content, $this->app->config->get('encrypt_key'));
+        return $res;
     }
 }
diff --git a/src/Kernel/AppClient.php b/src/Kernel/AppClient.php
index 8609b8d..5d7fe68 100755
--- a/src/Kernel/AppClient.php
+++ b/src/Kernel/AppClient.php
@@ -19,19 +19,19 @@ class AppClient extends BaseClient
      * 应用ID
      * @var string
      */
-    private $appId;
+    protected $appId;
 
     /**
      * 商户私钥值
      * @var string
      */
-    private $rsaPrivateKey;
+    protected $rsaPrivateKey;
 
     /**
      * 支付宝公钥值
      * @var string
      */
-    private $alipayrsaPublicKey;
+    protected $alipayrsaPublicKey;
 
     /**
      * 支付宝网关
@@ -49,7 +49,7 @@ class AppClient extends BaseClient
      * 签名类型
      * @var string
      */
-    private $signType = "RSA2";
+    protected $signType = "RSA2";
 
     /**
      * 接口版本
@@ -158,7 +158,6 @@ class AppClient extends BaseClient
             $sysParams["encrypt_type"] = $this->encryptType;
             $apiParams['biz_content'] = $this->encryptCode($apiParams['biz_content']);
         }
-
         //签名
         $sysParams["sign"] = $this->generateSign(array_merge($apiParams, $sysParams), $this->signType);
         $requestUrl = $this->buildRequestUrl($sysParams);
diff --git a/src/Payment/Fund/Client.php b/src/Payment/Fund/Client.php
index 05d5d24..7fee687 100755
--- a/src/Payment/Fund/Client.php
+++ b/src/Payment/Fund/Client.php
@@ -27,7 +27,7 @@ class Client extends AppClient
         $productCode = $payload['product_code'] ?? 'TRANS_ACCOUNT_NO_PWD';
         $contentBuilder->setProductCode($productCode);
         if (isset($payload['identity_type'])) {
-            $contentBuilder->setIdentity($payload['identity_type']);
+            $contentBuilder->setIdentityType($payload['identity_type']);
         }
         if (isset($payload['name'])) {
             $contentBuilder->setIdentityName($payload['name']);