The issued credit card security code is printed on the back of the card, and the last three digits of the signature column are generally indicated in italics. American express card security code is a special case, it is a four-digit number, printed directly on the front of the card. For the safety of credit card use, it is recommended that you keep the card by hand, and it is best to cover the security code with tape and other things.

1. What is the credit card password?

The credit card PIN code is the safety factor number of the credit card when conducting transactions through Internet technology or telephone. Generally, 3-or 4-digit data information is printed and packaged on credit cards, and the printing and packaging positions of different types of cards will be different. As usual, it is used to confirm that the payment belongs to the credit card when doing business, thus preventing credit card fraud. Credit card PIN codes have different names in different card organizations. For example, the PIN code of China UnionPay is called CVN2 (card verification number 2), with three-digit data information, and the bank card number is printed on the signature column on the back of the credit card. The PIN code of VISA card is called CVV2 (Card Verification Value 2), which has 3 digits of data information, printed on the signature column on the back of the credit card, and the last 4 digits of the bank card number are located at. MarsterCard's PIN code is called CVC2 (Card Verification Code 2), which has 3-digit data information, printed on the signature column on the back of the credit card, and the bank card number is located at. The PIN code of American Express is called CID (Card Identification Number), which has four-digit data information and is printed on the bank account of the credit card.

The PIN code of JCB card (Japan Credit Bureau) is called CAV2 (card authentication value 2), with 3 digits of data information printed on the signature column on the back of the credit card, and the bank card number is located at.

2. What is the function of credit card PIN code?

Credit card PIN code was mainly used for shopping on foreign websites some time ago. You don't need to provide a user name and password to shop on foreign websites. You only need to provide the bank card account number, expiration date and PIN code to handle the business. In recent years, some shops in China have begun to use PIN codes to change user names and passwords for payment, such as online payment in JD.COM. The vast majority of air tickets and hotel reservations are also based on the voucher PIN code. In addition, some personal online banks of financial enterprises must also accept credit card PIN codes when handling business.