Postal Savings Bank WeChat Bank ccv refers to the CCV code on the back of the credit card (also called the last three codes), which is an important element of online transactions. If you get the card number, expiration date and the last three codes, you can swipe your card online and treat it as yourself.

You can usually see it on the back of the card. I suggest you write down the last three yards after you get the card and scrape it off with a knife to prevent others from stealing your card information.