The American Express card security code is called CID, which has four digits and is printed on the front of the credit card above the credit card number. Security codes are as important as passwords. You don't need a password to shop on overseas websites. You can complete the transaction by providing the account number, expiration date and security code.

American Express Card is usually valid for 8 years, and American Express Centurion Card is valid. It is valid in the month on the front of the American Express Centurion Card, indicating that the card is the issuing time of your credit card. The total number of American Express cards is *** 15 digits. The card number must start with 37, and the following 13 bits are divided into 6 groups, which have different uses and meanings.