Credit card security code is the security code of credit card for online or telephone transactions. Generally, it is a 3-digit or 4-digit number printed on a credit card, and the printing position of different types of cards will be different. It is usually used to prove that the payer has a credit card at the time of transaction, thus preventing credit card fraud.

Location of different card security codes:

1) the security code of visa card is called CVV2 (card verification value 2), which has 3 digits and is printed on the last 4 digits of the card number on the back of the credit card. [3]?

MarsterCard's security code is called CVC2 (Card Verification Code 2), which has 3 digits and is printed on the back of the credit card number.

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

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

5) What is the security code of China UnionPay? CVN2 (Card Verification Number 2) has three digits, which are placed flat on the back of the credit card, after the last four digits of the card number.

6) 6) The security code of JCB card (Japan Credit Bureau) is called CAV2 (card authentication value 2), which has 3 digits and is printed on the last 4 digits of the card number on the back of the credit card.

Purpose of security code:

The credit card security code is equivalent to the credit card ID card, and we can use this code for consumer transactions. You don't need a password to shop on overseas websites. As long as the buyer provides the account number and security code, the transaction can be completed. In China, there are also merchants signing contracts with banks, but you don't need a credit card password, you only need a security code to complete the telephone transfer. 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.