Why do we ask for this? Basically, it is fraud prevention.

VISA & MASTERCARD

visa_master.bmp (10278 bytes)
If you have a Visa or a Mastercard the number is 3 digit long and is printed on the back of your credit card after your credit card number.

AMERICAN EXPRESS

amex.bmp (26678 bytes)
If you have an American Express Card the number will be 4 digits long and imprinted on the front of the card above your card number. If you have an Optima Card the number will be on the left side of the card for the rest of the American Express Cards the number will be on the right side of the card.