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The CVN is an anti-fraud measure used by card issuers to prevent payments from generated card numbers. The CVN is printed on the physical card, and is randomly assigned and therefore it cannot be auto-generated.

The CVN can be found in the following places:

Card Type Location
Visa Signature strip on back of card. Last digits of card number are re-printed in reverse italics, followed by 3-digit CVN.
MasterCard Signature strip on back of card. Last digits of card number are re-printed in reverse italics, followed by 3-digit CVN.
Amex 4 digit CVN above card number on front of card.
Diners Club Signature strip on back of card. Last digits of card number are re-printed in reverse italics, followed by 3-digit CVN.