diff --git a/app/Services/Payment/WxpayService.php b/app/Services/Payment/WxpayService.php
index 7b6de61f..ae91cfec 100644
--- a/app/Services/Payment/WxpayService.php
+++ b/app/Services/Payment/WxpayService.php
@@ -36,6 +36,14 @@ class WxpayService
 
         $app = $this->payment($payment);
 
+        // 服务商模式 (子商户)
+        $appId = config('wechat.payment.sub.app_id');
+        $mchId = config('wechat.payment.sub.mch_id');
+
+        if ($appId && $mchId) {
+            $params['sub_openid'] = Arr::pull($params, 'openid');
+        }
+
         $result = $app->order->unify($params);
 
         $this->validateResult($result, $params);
@@ -120,7 +128,18 @@ class WxpayService
             throw new WeChatPayException("支付 [{$name}] 配置未找到");
         }
 
-        return Factory::payment($config);
+        $app = Factory::payment($config);
+
+        // 服务商模式 (子商户)
+        $appId = config('wechat.payment.sub.app_id');
+        $mchId = config('wechat.payment.sub.mch_id');
+
+        if ($appId && $mchId) {
+            $params['sub_openid'] = Arr::pull($params, 'openid');
+            $app->setSubMerchant($mchId, $appId);
+        }
+
+        return $app;
     }
 
     /**
diff --git a/config/wechat.php b/config/wechat.php
index 60af8281..71dad1bf 100644
--- a/config/wechat.php
+++ b/config/wechat.php
@@ -72,6 +72,11 @@ return [
                 ],
             ],
         ],
+        // 服务商模式, 子商户
+        'sub' => [
+            'app_id' => env('WECHAT_PAYMENT_SUB_APPID'),
+            'mch_id' => env('WECHAT_PAYMENT_SUB_MCH_ID'),
+        ],
         // 商城 - 微信小程序支付
         'mini_program' => [
             'sandbox' => env('WECHAT_PAYMENT_SANDBOX', false),