1. First, open JD.COM official website or mobile APP, enter your account number and password on the login page, browse the products you want to buy, and choose the products that suit your needs to join the shopping cart.

2. Secondly, after confirming the commodity information on the shopping cart page, click "Go to Settlement" to enter the order settlement page, and the payment method is JD.COM White Bar.

3. Finally, on the payment page, find the coupon input box and enter the coupon code of JD.COM White Bar minus 80. After confirming that the coupon code is entered correctly, continue to complete the payment steps of the order and complete the payment process according to the interface prompts.