The credit card security code is also commonly known as a credit card Validation Code. This 3 or 4 digit code is embossed or imprinted on the reverse side of Visa, MasterCard and Discover cards and on the front of American Express cards. This is an extra security measure to ensure that you have access or physical possession of the credit card itself in order to use the CVV code. For details on where to find your CVV code, please check below.
VISA, MasterCard, Discover - It is the last 3 digits after the credit card number on the back of the card in the signature area.
American Express - The code is printed on the front of the card, above and to the right of the embossed card number.