|Index||-||FAQ - Cart Help Buttons - Cart Settings - 4. Payment/Gateway Settings|
Some credit cards are issued with a code of 3 or 4 additional digits.
With this setting, you can select to "Allow", "Require", or even "Don't Ask For" the verification number.
Here are some common examples of where these numbers can be located on your card.
Please note that VISA/MasterCard regulations prohibit the cart system's storing of this number for any transactions. It can only be immediately used to pass to your real-time payment processor.