The credit card security code is located in the signature column on the back of the card. The total number is seven digits, and the first four digits are the last four digits of the card number. The last three digits are the card-not-present transaction verification code of the credit card. According to bank staff, the last three digits of the signature column on the back of the credit card are the card-not-present transaction password verification code, which is the verification code used by cardholders to verify their identity when making card-less purchases. . It should be reminded that once the cardholder discloses these three digits, the card amount can easily be stolen!

This is a security feature of credit cards when conducting online transactions and telephone transactions. It is usually a 3 or 4-digit number printed on a credit card and is used to verify that the payer owns the credit card at the time of the transaction, thus preventing credit card fraud.

The credit card security code is a set of 3 or 4 digits on the credit card. The generation method is that the bank extracts the card account number, validity period, and service code, arranges them, and then calculates them through a series of complex algorithms. After this set of numbers is generated, only the issuing bank and the bank card holder know what the number is.