diff --git a/WePayV3/Order.php b/WePayV3/Order.php
index 489f386..0ad4284 100644
--- a/WePayV3/Order.php
+++ b/WePayV3/Order.php
@@ -64,14 +64,13 @@ class Order extends BasicWePay
             // 支付参数签名
             $time = strval(time());
             $appid = $this->config['appid'];
-            $prepayId = $result['prepay_id'];
             $nonceStr = Tools::createNoncestr();
             if ($type === 'app') {
-                $sign = $this->signBuild(join("\n", [$appid, $time, $nonceStr, $prepayId, '']));
-                return ['partnerId' => $this->config['mch_id'], 'prepayId' => $prepayId, 'package' => 'Sign=WXPay', 'nonceStr' => $nonceStr, 'timeStamp' => $time, 'sign' => $sign];
+                $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' => $sign];
             } elseif ($type === 'jsapi') {
-                $sign = $this->signBuild(join("\n", [$appid, $time, $nonceStr, "prepay_id={$prepayId}", '']));
-                return ['appId' => $appid, 'timeStamp' => $time, 'nonceStr' => $nonceStr, 'package' => "prepay_id={$prepayId}", 'signType' => 'RSA', 'paySign' => $sign];
+                $sign = $this->signBuild(join("\n", [$appid, $time, $nonceStr, "prepay_id={$result['prepay_id']}", '']));
+                return ['appId' => $appid, 'timeStamp' => $time, 'nonceStr' => $nonceStr, 'package' => "prepay_id={$result['prepay_id']}", 'signType' => 'RSA', 'paySign' => $sign];
             } else {
                 return $result;
             }