Visa/MasterCard Requirements Card Validation Code		American Express Requirements Card Validation Code
The 3-digit, non-embossed number printed on the signature panel on the back of the card immediately following the credit card account number. This number is required as an additional security precaution.		The 4-digit, non-embossed number printed above your account number on the front of your card. This number is required as an additional security precaution.