The meaning of the last three digits of the signature on the back of China Merchants Bank's credit card

I. Identification

The "last three digits code" is the last three digits located at the signature on the back of the credit card, also known as CVV or CVC code, which is generated by the coding rules and encryption algorithm of the issuing bank. Generally speaking, these three numbers are unique and are used to identify individuals. Generally, it is impossible to pay for an input error.

Second, there is authorization.

In the process of use and payment, 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.

Third, prevent brush theft.

Banks have strict supervision over credit cards. For example, a credit card with an overdraft limit of 50,000 yuan will be overdrawn once in a short time. If the issuing bank suspects that the card has a tendency to cash out, it will remind the cardholder. If the reminder is invalid, the right to use the credit card will be suspended.