Nov 17, 2014 Credit Card Validation. Credit Card Validation. My question is what am I missing in my code to not make visa and MasterCard run at the same time?
How to locate your credit card validation number Card Validation Number - VISA, MASTERCARD, DISCOVER and AMEX The card validation number is printed on the back of your Visa, MasterCard or Discover card in the signature area of the card. It is the last 3 digits AFTER the credit card number in the signature region. American Express has its card validation number on the front of the card, printed above and to the right of the imprinted card number. If you have one of these cards but do not have the new validation number printed on the card, please use a different card or contact your credit agency and request the validation number and/or a new card with the number printed on it.