The CVV2 or CVC2 three-digit value is printed on the signature panel on the back of Visa card or MasterCard immediately following the Visa/Mastercard account number. Click for illustrations showing the location of this code on Visa/MasterCard.

Where is CID Located in American Express card? They are four digits printed (not embossed) on the right front of the card above the credit card number.

Visa	Card Verification Value (CVV2)	Three digits to the right of the credit card number in the signature area on back of the card.
MasterCard	Card Verification Code (CVC2)	Three digits to the right of the credit card number in the signature area on back of the card.
American Express	Card Identification Number (CID)	Four digits printed (not embossed) on the right front of the card above the credit card number.