CVV field management

In this document we define CVV the 3- or 4-figure number printed on the back of the credit card. It is called in different names according to card issuing company (CVV2 for Visa, 4DBC for American Express, CVC2 for Mastercard).

This number was introduced to increase payments security, as it reduces the chance of the credit card being used by someone who is not in its actual possession.