What does cvv of China Construction Bank mean?

The credit card CVV code (credit card security code) of China Construction Bank is used to prove that the payer does have a credit card at the time of transaction. It is the only card holder's character that even the staff of China Construction Bank can't get from the industry system. Usually when shopping on overseas websites and online or telephone transactions of some domestic merchants (such as hotel reservation, air ticket reservation, etc. ), the transfer can be completed only by CVV code and card number.

1. What is the security code of the credit card?

The credit card security code is equivalent to the credit card ID card, and we can use this code for consumer transactions. That is, the security code of the credit card when conducting 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.

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.

2. The security code of each card organization

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.

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

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.

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 UnionPay card (China Pay) is called CVN2 (card verification number 2), which has 3 digits and is printed on the back of the credit card with 4 digits after the card number.

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 back of the credit card number.