1. What is CVV2?
    CVV2 is an authentication mechanism created by card companies to help reduce fraud with online transactions. It requires the card holder to have the card physically in hand in order to enter three or four digits found printed on the card itself.

  2. Where do I find the numbers?
    On Visa and  MasterCard the number is located on the back of the card in the signature area:
    Visa CVV2