On a Visa, MasterCard or Discover, please turn your card over and look in the signature strip. You will find (either the entire 16-digit string of your card number, OR just the last 4 digits), followed by a space, followed by a 3-digit number. That 3-digit number is your CVV2 number. (See below)

On American Express Cards, the CVV2 number is a 4-digit number that appears above the end of your card number. (See below)

Visa, MasterCard & Discover:

This number is printed on your MasterCard & Visa cards in the signature area of the back of the card. (it is the last 3 digits AFTER the credit card number in the signature area of the card). IF YOU CANNOT READ YOUR CVV2 NUMBER, YOU WILL HAVE TO CONTACT THE ISSUING CREDITOR.

American Express:

American Express cards show the CVV2 printed above and to the right of the imprinted card number on the front of the card.