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2. Address verification service - Wikipedia

   en.wikipedia.org/wiki/Address_verification_service

   An address verification service (AVS) is a service provided by major credit card processors to enable merchants to authenticate ownership of a credit or debit card used by a customer. [1] AVS is done as part of the merchant's request for authorization in a non-face-to-face credit card transaction.

3. Check verification service - Wikipedia

   en.wikipedia.org/wiki/Check_verification_service

   Some routing number verification systems use an algorithm to validate the routing number, rather than cross reference the results in a database. Routing number verification is limited to verifying the bank name, address and phone number and cannot determine if the checking account is valid of perform funds verification.

4. Card security code - Wikipedia

   en.wikipedia.org/wiki/Card_security_code

   There are several types of security codes and PVV (all generated from DES key in the bank in HSM modules using PAN, expiration date and service code): . The first code, 3 numbers, called CVC1 or CVV1, is encoded on track one and two of the magnetic stripe of the card and used for card present transactions, with signature (second track also contains pin verification value, PVV, but now it is ...

5. Payment card number - Wikipedia

   en.wikipedia.org/wiki/Payment_card_number

   A payment card number, primary account number (PAN), or simply a card number, is the card identifier found on payment cards, such as credit cards and debit cards, as well as stored-value cards, gift cards and other similar cards. In some situations the card number is referred to as a bank card number. The card number is primarily a card ...

6. Luhn algorithm - Wikipedia

   en.wikipedia.org/wiki/Luhn_algorithm

   Therefore, systems that pad to a specific number of digits (by converting 1234 to 0001234 for instance) can perform Luhn validation before or after the padding and achieve the same result. The algorithm appeared in a United States Patent [ 1 ] for a simple, hand-held, mechanical device for computing the checksum.

7. Credit card fraud - Wikipedia

   en.wikipedia.org/wiki/Credit_card_fraud

   Whereas banks and card companies prevented £1.66 billion in unauthorised fraud in 2018. That is the equivalent to £2 in every £3 of attempted fraud being stopped. [3] Credit card fraud can occur when unauthorized users gain access to an individual's credit card information in order to make purchases, other transactions, or open new accounts.