After binding your credit card to mobile apps such as Alipay, UnionPay, and WeChat, you can show the payment QR code to the merchant.

Take WeChat binding as an example. Payment code payment means that the user displays the "payment code" in the WeChat wallet to the merchant system to scan and then complete the payment directly. It is suitable for face-to-face cashier scenarios in offline places, such as merchants. Physical places with clear business addresses such as supermarkets, convenience stores, restaurants, hospitals, schools, cinemas and tourist attractions. The specific steps are as follows:

The first step is to open WeChat on your mobile phone, click on the "Me" column on the bottom menu, and click to enter "Wallet".

The second step is to enter the wallet and click "Bank Card".

The third step, after entering, the bound debit card and credit card will be displayed, click "+Add Bank Card".

The fourth step, in the pop-up page, fill in the basic information of the credit card to be bound, such as card number, bank, password, cardholder information, etc. After successful verification, the card is bound successfully.

The fifth step is to click on the "WeChat" column at the bottom of WeChat, click on the "+" in the upper right corner, and then select "Receipt and Payment".

Step 6: There is a line of small words in the middle of the payment interface that says "Use this payment method first". Click to select and set it to the credit card you just bound. Then you can use the credit card to pay through the WeChat QR code.

Reference: Tencent-WeChat Payment