Card security code

CSC (card security code) is a 3- or 4- digit code found on your credit card that helps ensure your credit card is present when your purchase is made. For Visa, MasterCard, Diners Club, and Discover Cards the CSC number is the 3-digit value printed on the signature panel on the back of your card immediately following the credit card account number. For American Express Cards the CSC number is the 4-digit, non-embossed number printed above your account number on the face of your card.

Card verification number