Operating environment: Huawei Enjoy 20, HarmonyOS2.0.0, Alipay 10.3.90, etc.

1. Download and install the corresponding payment application, such as Alipay.

2. Add a bank card or credit card to the payment application and ensure that the account has sufficient balance.

3. Turn on the self-service ticket vending machine or gate in the subway station, and select the function of "scanning code to enter the station" or "brushing code to enter the station".

4. Open the payment application and select the corresponding QR code payment function.

5. Put the QR code in the payment application in the scanning area of the self-service ticket vending machine or gate and wait for the system to identify it.