report the loss and reissue it.

the last three digits are the security code of the credit card. Whether it is a credit card organized by VISA or MASTER, the generation principle of its security code is the same.

The security code of credit card is mainly the verification code when online transaction or credit card is cancelled. The three digits on the back, like the cardholder's signature, belong to the seven digits on the back of a "confidential" credit card and should be properly kept.

it is suggested that cardholders who are keen on online transactions must ensure the authenticity and legality of the merchants who conduct transactions, and do not disclose the card information to other people casually, otherwise it will leave security risks. The first four digits are the last four digits of the credit card number? .

Extended information:

Printing location of credit card security code

The security code of p>VISA card is called CVV2(Card Verification Value 2), which has 3 digits and is printed on the back of the credit card at the last 4 digits of the card number.

the security code of MarsterCard is called CVC2(Card Validation Code 2), which has 3 digits and is printed on the back of the credit card at the last 4 digits of the card number.

the security code of the Discover Card is called Cardmember ID, which has 3 digits and is printed on the signature column on the back of the credit card.

the security code of American Express is called CID(Card Identification Number), which has 4 digits and is printed on the front of the credit card above the credit card number.

the security code of China UnionPay is called CVN2(Card Validation Number 2), which has 3 digits and is printed on the back of the credit card after the last 4 digits of the card number.

the security code of p>JCB card (Japan Credit Bureau) is called CAV2( Card Authentication Value 2), which has 3 digits and is printed on the back of the credit card at the last 4 digits of the card number.

Main uses

The credit card security code is equivalent to the credit card ID card, which can be used for consumer transactions.

You don't need a password when shopping on overseas websites. You can complete the transaction as long as the buyer provides the account number and security code. In China, there are also merchants who sign contracts with banks, but you don't need a credit card password, and you can complete the telephone transfer only with the security code. Therefore, you must take good care of your credit card, and don't let it leave your sight when you consume it, so as to avoid others remembering the account number and security code of the credit card.

Baidu encyclopedia-credit card security code