The 'success' message was returned when calling the changing the status to product in preparation API, but in WING system continues to expose 'payment completed' status. Due to a surge in incoming orders, some system delays may occur. Usually, even if there is a delay, it is processed within 30 minutes. If the status does not change after more than an hour of preparation, please make an online inquiry. Related articles In case of custom-made products, the extraInfoMessage(guide message for custom-made products) has to be entered during the product creation stage. Can you also check this message in the purchase order? Is partial cancellation reflected to a PO? When I register a Direct Courier Delivery (DIRECT) waybill, it is not processed as Delivery Completed. Is there a limit to the speed of requests for product registration and modification API usage? Is it possible to change the shipping address when the order is in the product in preparation status?