the American express card security code is called CID, which has 4 digits and is printed on the front of the credit card above the credit card number. The importance of the security code is equal to the password. Shopping on overseas websites does not require a password, and the transaction can be completed by providing the account number, expiration date and security code.

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