What is American Express security code?

This security code is not the card’s PIN. This security code is also referred to as a CVV or a CID. CVV stands for card verification value, and CID stands for card identification number. When You Need Your American Express Security Code

What is a 3 digit Amex card code?

3 digit code is a separate verification number for the card itself - if you call customer service they'll ask for that code to verify that you physically have the card. Another layer of security. Doesn't AMEX tell you the 4 digit code is the equivalent of the CVV on other cards when you get the card? Probably but my husband opened the card.

How do I know if my Amex card has a security code?

Amex cards have two security codes — a three-digit number on the back and a four-digit one on the front. For purchases and regular transactions, you’ll use the code on the front. However, Amex might ask you for the number on the back as well for verification purposes. Terms apply.