diff --git a/WePayV3/Order.php b/WePayV3/Order.php
index fb83e43..09b41a5 100644
--- a/WePayV3/Order.php
+++ b/WePayV3/Order.php
@@ -66,7 +66,7 @@ class Order extends BasicWePay
             $nonceStr = Tools::createNoncestr();
             if ($type === self::WXPAY_APP) {
                 $sign = $this->signBuild(join("\n", [$appid, $time, $nonceStr, $result['prepay_id'], '']));
-                return ['partnerId' => $this->config['mch_id'], 'prepayId' => $result['prepay_id'], 'package' => 'Sign=WXPay', 'nonceStr' => $nonceStr, 'timeStamp' => $time, 'sign' => $sign];
+                return ['appId' => $appid, 'partnerId' => $this->config['mch_id'], 'prepayId' => $result['prepay_id'], 'package' => 'Sign=WXPay', 'nonceStr' => $nonceStr, 'timeStamp' => $time, 'sign' => $sign];
             } elseif ($type === self::WXPAY_JSAPI) {
                 $sign = $this->signBuild(join("\n", [$appid, $time, $nonceStr, "prepay_id={$result['prepay_id']}", '']));
                 return ['appId' => $appid, 'timestamp' => $time, 'timeStamp' => $time, 'nonceStr' => $nonceStr, 'package' => "prepay_id={$result['prepay_id']}", 'signType' => 'RSA', 'paySign' => $sign];