fix the bug of wxRefund in service mode

composer.json

 {
     "name": "ldy/payment",
     "type": "library",
-    "version": "3.3.8",
+    "version": "3.3.9",
     "description": "支付宝支付、微信支付、招商一网通支付、通联支付、米付支付、利楚扫呗、富友支付 php SDK。",
     "keywords": ["alipay", "weixin", "支付宝支付", "微信支付","通联支付", "集成支付接口SDK", "招商一网通", "一网通", "利楚扫呗", "富友支付"],
     "homepage": "",

src/Common/Weixin/Data/Charge/PubChargeData.php

@@ -16,8 +16,6 @@ use Payment\Utils\ArrayUtil;
  * 微信公众号支付
  *
  * @property string $openid  trade_type=JSAPI，此参数必传，用户在商户appid下的唯一标识
- * @property string $sub_appid 微信分配的子商户公众账号ID
- * @property string $sub_mch_id    微信支付分配的子商户号
  * @property string $sub_openid 用户在子商户appid下的唯一标识
  *
  * @package Payment\Common\Weixin\Data\Charge

src/Common/Weixin/Data/RefundData.php

@@ -43,6 +43,10 @@ class RefundData extends WxBaseData
             'refund_fee' => $this->refund_fee,// 退款总金额
             'op_user_id'    => $this->operator_id,//操作员帐号, 默认为商户号
             'refund_account' => $this->refund_account,// 退款账户类型
+
+            // 服务商模式
+            'sub_appid' => $this->sub_appid,
+            'sub_mch_id' => $this->sub_mch_id,
         ];
 
         $this->retData = ArrayUtil::paraFilter($this->retData);
@@ -51,6 +55,7 @@ class RefundData extends WxBaseData
     /**
      * 检查参数
      *
+     * @throws PayException
      */
     protected function checkDataParam()
     {

src/Refund/WxRefund.php

@@ -93,7 +93,7 @@ class WxRefund extends WxBaseStrategy
         // 将订单退款金额处理为元
         $refund_fee = bcdiv($data['refund_fee'], 100, 2);
 
-        $retData = [
+        return [
             'is_success'    => 'T',
             'response'  => [
                 'transaction_id'   => $data['transaction_id'],
@@ -111,8 +111,6 @@ class WxRefund extends WxBaseStrategy
                 'cash_refund_fee' => bcdiv($data['cash_refund_fee'], 100, 2),
             ],
         ];
-
-        return $retData;
     }
 
     /**