When you use the cash on delivery payment method, please select cash on delivery when confirming the payment method of the order information, and choose the payment method (cash, mobile POS) used for cash on delivery. After the order is generated, the payment method of cash on delivery cannot be changed to other payment methods. If you want to change to other payment methods, please be sure to delete the original cash on delivery order and place an order on the website again to select other payment methods.