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2. Luhn algorithm - Wikipedia

   en.wikipedia.org/wiki/Luhn_algorithm

   The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers.

3. 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.

4. Check verification service - Wikipedia

   en.wikipedia.org/wiki/Check_verification_service

   Outside the United States the decline in check usage in favour of debit cards and credit cards has meant that cheques are rarely accepted by merchants thus rendering cheque verification services obsolete. In the United States, there are a number of third-party companies that provide check verification services.

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. 3-D Secure - Wikipedia

   en.wikipedia.org/wiki/3-D_Secure

   3-D Secure is a protocol designed to be an additional security layer for online credit and debit card transactions. The name refers to the "three domains" which interact using the protocol: the merchant/acquirer domain, the issuer domain, and the interoperability domain.

7. What is a credit card security code? - AOL

   www.aol.com/finance/credit-card-security-code...

   Credit card security codes are three-digit codes on the back of your card (four-digits on the front if you have an American Express card) used to verify that have the physical card. You typically ...