The card binding process of China UnionPay Express APP is as follows: After registering and logging in China UnionPay Express APP, click "+"-"Add Bank Card" in the upper right corner of the homepage or "+"in the upper right corner of card management, and manually enter the card number or take a photo to identify the card number through one-click card binding (select the corresponding bank), and bind the bank card according to the page prompts.

China UnionPay Express APP credit card repayment operation is as follows:

1. Log in to China UnionPay Express APP and click "Credit Card Repayment" on the homepage;

2. Enter the credit card repayment page, select the credit card to be repaid (if no credit card is added, click "Add Credit Card"), and confirm the repayment after entering relevant information according to the page prompts.

The above contents are for reference, subject to the display of China UnionPay Express APP.