The Card Security Code (CSC) is a 3- or 4-digit number printed on your credit card. It provides added security when you use your card on the Internet or over the phone. The number appears only on the card itself, not on receipts or statements.
The CSC is always located above the account number on the face of the card, sometimes on the left side and sometimes on the right. Note: Some American Express cards have a 4-digit number below the account number. This is not the CSC.
Turn the card over and look at the signature box. You will find either the entire 16-digit credit card number or just the last 4 digits, followed by the 3-digit CSC.
