1. Download and install the China UnionPay Express application in your mobile phone, and add commonly used bank cards to China UnionPay Express.

2. After entering the main interface of China UnionPay Express, find the card list option in My Wallet Options and click Open.

3. After entering the card list interface, click the credit card that needs to add the mobile phone flash payment function.

4. After adding a credit card with mobile phone flash payment function, click Open to view the card details.

5. In the card details interface, find the option to enable the mobile phone flash payment function.

6. At this time, a prompt will pop up to request the server. After that, a prompt will pop up on the interface. Please open ncf. To open ncf, just put your finger on the top of the phone interface, drag it down in the status bar, and find the word ncf in the dragged black background interface.

7. Enter the cvn2 code of the credit card, then enter the validity period of the credit card, check the mobile phone number and click Next.

8. After obtaining and entering the SMS verification code, click Next, and the interface prompts that the mobile phone flash payment has been successfully opened.