For your safety and security, our card processing server requires that you enter your card verification number, if one is available. The verification number is a 3 or 4 digit number printed on your card. If you are using a Visa or MasterCard, it is a 3 digit number that appears to the right of your card number on the back of your card: If you are using an American Express card, the verification number is a 4 digit number that appears on the front of your card, above and either on the left or right of the card number: If your card does not have a verification number, please enter the number 000.