diff --git a/README.md b/README.md
index eab2ad6cac85221825ffd7f3ddc3843a0edea3ed..be1cd123881dd0b07d6f0203c17906482a75e8d5 100644
--- a/README.md
+++ b/README.md
@@ -10,13 +10,15 @@
 <a href="https://packagist.org/packages/yansongda/pay"><img src="https://poser.pugx.org/yansongda/pay/license" alt="License"></a>
 </p>
 
+**！注意：v1.x 版本将不做新功能开发，只进行 bug 维护！请大家尽快迁移到 v2 版本！**
+
 开发了多次支付宝与微信支付后，很自然产生一种反感，惰性又来了，想在网上找相关的轮子，可是一直没有找到一款自己觉得逞心如意的，要么使用起来太难理解，要么文件结构太杂乱，只有自己撸起袖子干了。
 
 **说明，请先熟悉支付宝说明文档！！**
 
 欢迎 Star，欢迎 PR！
 
-laravel 扩展包请 [传送至这里](https://github.com/yansongda/laravel-pay)
+laravel 扩展包请 [https://github.com/yansongda/laravel-pay](https://github.com/yansongda/laravel-pay)
 
 ## 特点
 - 命名不那么乱七八糟
@@ -117,7 +119,7 @@ SDK 中对应的 driver 和 gateway 如下表所示：
 
 ## 安装
 ```shell
-composer require yansongda/pay
+composer require "yansongda/pay:^1.0"
 ```
 
 ## 使用说明
diff --git a/src/Gateways/Alipay/Alipay.php b/src/Gateways/Alipay/Alipay.php
index 6d829fda714f494e13acd9b109ee9ab3139da3d9..2761e4eab1e38d1b9ed1930e0dad322d4802fbe2 100644
--- a/src/Gateways/Alipay/Alipay.php
+++ b/src/Gateways/Alipay/Alipay.php
@@ -15,7 +15,7 @@ abstract class Alipay implements GatewayInterface
     /**
      * @var string
      */
-    protected $gateway = 'https://openapi.alipay.com/gateway.do'.'?charset=utf-8';
+    protected $gateway = 'https://openapi.alipay.com/gateway.do?charset=UTF-8';
 
     /**
      * alipay global config params.
@@ -50,7 +50,7 @@ abstract class Alipay implements GatewayInterface
             'app_id'      => $this->user_config->get('app_id'),
             'method'      => '',
             'format'      => 'JSON',
-            'charset'     => 'utf-8',
+            'charset'     => 'UTF-8',
             'sign_type'   => 'RSA2',
             'version'     => '1.0',
             'return_url'  => $this->user_config->get('return_url', ''),
@@ -194,11 +194,11 @@ abstract class Alipay implements GatewayInterface
     protected function buildPayHtml()
     {
         $sHtml = "<form id='alipaysubmit' name='alipaysubmit' action='".$this->gateway."' method='POST'>";
-        while (list($key, $val) = each($this->config)) {
+        foreach ($this->config as $key => $val) {
             $val = str_replace("'", '&apos;', $val);
             $sHtml .= "<input type='hidden' name='".$key."' value='".$val."'/>";
         }
-        $sHtml .= "<input type='submit' value='ok' style='display:none;''></form>";
+        $sHtml .= "<input type='submit' value='ok' style='display:none;'></form>";
         $sHtml .= "<script>document.forms['alipaysubmit'].submit();</script>";
 
         return $sHtml;
@@ -220,6 +220,10 @@ abstract class Alipay implements GatewayInterface
         $this->config['method'] = $method;
         $this->config['sign'] = $this->getSign();
 
+        $this->config = array_filter($this->config, function ($value) {
+            return $value !== '' && !is_null($value);
+        });
+
         $method = str_replace('.', '_', $method).'_response';
 
         $data = json_decode($this->post($this->gateway, $this->config), true);
diff --git a/src/Gateways/Alipay/AppGateway.php b/src/Gateways/Alipay/AppGateway.php
index b1861bef7309eb3be164ab56b63ef195c653cc71..1e2940b75016301cfd72ceb18b5011e56a0f3005 100644
--- a/src/Gateways/Alipay/AppGateway.php
+++ b/src/Gateways/Alipay/AppGateway.php
@@ -41,6 +41,16 @@ class AppGateway extends Alipay
     {
         parent::pay($config_biz);
 
+
+        /**
+         * 支付宝支付报错 alin10146,原因支付宝不允许传空值，如return_url或notify_url有时为空，造成签名错误
+         * @author kingofzihua
+         * @link https://github.com/yansongda/pay/issues/119#ref-commit-bb4abeb
+         */
+        $this->config = array_filter($this->config, function ($value) {
+            return $value !== '' && !is_null($value);
+        });
+        
         return http_build_query($this->config);
     }
 }
diff --git a/src/Gateways/Wechat/Wechat.php b/src/Gateways/Wechat/Wechat.php
index f63bb7403f244e0a3fd609e457d16338f93fa2a1..9b1d04ab8adc36a279da60bbc8ea79257e147837 100644
--- a/src/Gateways/Wechat/Wechat.php
+++ b/src/Gateways/Wechat/Wechat.php
@@ -92,8 +92,12 @@ abstract class Wechat implements GatewayInterface
      */
     public function refund($config_biz = [])
     {
+        if (isset($config_biz['miniapp'])) {
+            $this->config['appid'] = $this->user_config->get('miniapp_id');
+            unset($config_biz['miniapp']);
+        }
+
         $this->config = array_merge($this->config, $config_biz);
-        $this->config['op_user_id'] = isset($this->config['op_user_id']) ?: $this->user_config->get('mch_id', '');
 
         $this->unsetTradeTypeAndNotifyUrl();