diff --git a/Test/pay-refund-create.php b/Test/pay-refund-create.php
index d25f2fa..02b554b 100644
--- a/Test/pay-refund-create.php
+++ b/Test/pay-refund-create.php
@@ -26,6 +26,7 @@ try {
     // 4. 组装参数，可以参考官方商户文档
     $options = [
         'transaction_id' => '1008450740201411110005820873',
+        'out_refund_no'  => '商户退款单号',
         'total_fee'      => '1',
         'refund_fee'     => '1',
     ];
diff --git a/Test/pay-refund-query.php b/Test/pay-refund-query.php
index b344a0c..a812ac4 100644
--- a/Test/pay-refund-query.php
+++ b/Test/pay-refund-query.php
@@ -26,10 +26,11 @@ try {
     // 4. 组装参数，可以参考官方商户文档
     $options = [
         'transaction_id' => '1008450740201411110005820873',
-        'total_fee'      => '1',
-        'refund_fee'     => '1',
+        // 'out_trade_no'   => '商户订单号',
+        // 'out_refund_no' => '商户退款单号'
+        // 'refund_id' => '微信退款单号',
     ];
-    $result = $wechat->refund($options);
+    $result = $wechat->queryRefund($options);
 
     var_export($result);
 
diff --git a/WeChat/Exceptions/InvalidArgumentException.php b/WeChat/Exceptions/InvalidArgumentException.php
index 44a7802..993c4e0 100644
--- a/WeChat/Exceptions/InvalidArgumentException.php
+++ b/WeChat/Exceptions/InvalidArgumentException.php
@@ -32,7 +32,7 @@ class InvalidArgumentException extends \InvalidArgumentException
      * @param integer $code
      * @param array $raw
      */
-    public function __construct($message, $code, $raw = [])
+    public function __construct($message, $code = 0, $raw = [])
     {
         parent::__construct($message, intval($code));
         $this->raw = $raw;
diff --git a/WeChat/Exceptions/InvalidDecryptException.php b/WeChat/Exceptions/InvalidDecryptException.php
index 986dbe3..f45c058 100644
--- a/WeChat/Exceptions/InvalidDecryptException.php
+++ b/WeChat/Exceptions/InvalidDecryptException.php
@@ -32,7 +32,7 @@ class InvalidDecryptException extends \Exception
      * @param integer $code
      * @param array $raw
      */
-    public function __construct($message, $code, $raw = [])
+    public function __construct($message, $code = 0, $raw = [])
     {
         parent::__construct($message, intval($code));
         $this->raw = $raw;
diff --git a/WeChat/Exceptions/InvalidResponseException.php b/WeChat/Exceptions/InvalidResponseException.php
index d5a2c12..c3cb892 100644
--- a/WeChat/Exceptions/InvalidResponseException.php
+++ b/WeChat/Exceptions/InvalidResponseException.php
@@ -32,7 +32,7 @@ class InvalidResponseException extends \Exception
      * @param integer $code
      * @param array $raw
      */
-    public function __construct($message, $code, $raw = [])
+    public function __construct($message, $code = 0, $raw = [])
     {
         parent::__construct($message, intval($code));
         $this->raw = $raw;
diff --git a/WeChat/Exceptions/LocalCacheException.php b/WeChat/Exceptions/LocalCacheException.php
index ce22934..35be83a 100644
--- a/WeChat/Exceptions/LocalCacheException.php
+++ b/WeChat/Exceptions/LocalCacheException.php
@@ -33,7 +33,7 @@ class LocalCacheException extends \Exception
      * @param integer $code
      * @param array $raw
      */
-    public function __construct($message, $code, $raw = [])
+    public function __construct($message, $code = 0, $raw = [])
     {
         parent::__construct($message, intval($code));
         $this->raw = $raw;