增加transaction_id

app/Http/Controllers/Api/WxpayController.php

@@ -397,6 +397,7 @@ class WxpayController
 					// 支付成功
 					if ($message['result_code'] === 'SUCCESS') {
 						try {
+							$order->transaction_id = $message['transaction_id'];
 							$order->paid_money = $message['total_fee'] / 100;
 							$order->paid_at = now();
 							$order->status = 1;