What is CVV2 / Security Code? CVV2 is a security measure we require for all transactions. Since a CVV2 number is listed on your credit card, but is not stored anywhere, the only way to know the correct CVV2 number for your credit card is to physically have possession of the card itself. All Visa, MasterCard, Discover and American Express cards made in America in the past 5 years or so have a CVV2 number.   How to find your CVV2 / Security Code number? 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, Discover 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. Close this window.