1. Open Taobao APP, select the goods you want to buy and put them in the shopping cart. The total price of the goods exceeds that of 3 yuan. Click the "Buy" button below to enter the order payment page.

2. In the payment page, select the installment payment method, select the Bank of Communications credit card, check the "Use discount" option (3 yuan will be reduced to 15 yuan), and enter the password to pay. After the payment is successful, the words "Enjoy discount" will be displayed in the order page.