How to treat the check code of Bank of Communications credit card?

The credit card check code is usually 3 or 4 digits printed on the credit card.

The specific location is as follows:

Its generation method is that the bank extracts the account number, validity period and service code of the card, arranges them and then calculates them through a series of complicated algorithms. After this set of numbers is generated, only the issuing bank and the holder of the bank card know what this number is. It is usually used to prove that the payer has a credit card at the time of transaction, thus preventing credit card fraud.

Extended data

The credit card check code is equivalent to the credit card ID card, and we can use this code for consumer transactions. Shopping on overseas websites does not require a password. As long as the buyer provides the account number and security code, the transaction can be completed.

In China, there are also merchants who sign contracts with banks. They do not need credit card passwords, but only need security codes to complete telephone transfers. Therefore, everyone must take good care of their credit cards, and don't let them leave their sight when spending, so as to avoid others remembering your credit card account number and security code.

Baidu encyclopedia-credit card security code