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How to bind China UnionPay Express Credit Card and how to write the validity period of ID card?
The validity period of the ID card bound credit card of China UnionPay Express:

1. Open the China UnionPay Express APP and click Enter.

2. Enter the APP and click "Card Management" at the bottom of the page.

3. Click "Click Card Now" on the page.

4. Enter "cvn2 code" and a prompt will pop up.

5. Check the location with 3 digits after the card.

6. Enter the validity period in the following format.