Jana 您好，
他的常見問答 有提到：you can make your payment/invoice/shipping plugin compatible with the Sequential orders. Instead of referencing $order->id or $order->get_id() when fetching order data, use $order->get_order_number()  

您的程式裡有 $order->id 或 $order->get_id() 的嗎？0.0a 我這樣問對嗎？