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? When I register a Direct Courier Delivery (DIRECT) waybill, it is not processed as Delivery Completed. Is partial cancellation reflected to a PO? Is it possible to change the shipping address when the order is in the product in preparation status? Is there a limit to the speed of requests for product registration and modification API usage?