The last three digits of the credit card signature column are displayed in italics at the top of the end of the signature, and relevant users can view them on their credit cards.

The last three digits on the back of a credit card are used to confirm whether the card owner is trading, which is almost as important as the password, that is, the security check code of the relevant card, that is, the "CVV code".

In the payment process, if the merchant provides the last three codes to the bank, the bank will obtain the authorization of the cardholder to the merchant by default, thus allowing the transaction.