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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. 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.

  4. Check verification service - Wikipedia

    en.wikipedia.org/wiki/Check_verification_service

    Some banks bundle a level of this service with a business checking account or with a bank credit card acceptance program. Check verification companies will often offer one, two, or all of the different services in their own system. Some check verification services also offer collection agency service [2] for the civil prosecution of check fraud.

  5. Identify legitimate AOL websites, requests, and communications

    help.aol.com/articles/identify-legitimate-aol...

    We never ask for personal info, such as credit card numbers or passwords, in emails. However, from time to time, we'll ask you to update your recovery info after signing in. You'll also get a notification titled “Your AOL account information has changed” if any info in your account settings are updated.

  6. 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.

  7. Check digit - Wikipedia

    en.wikipedia.org/wiki/Check_digit

    The final digit of a Universal Product Code, International Article Number, Global Location Number or Global Trade Item Number is a check digit computed as follows: [3] [4]. Add the digits in the odd-numbered positions from the left (first, third, fifth, etc.—not including the check digit) together and multiply by three.

  8. Third-party verification - Wikipedia

    en.wikipedia.org/wiki/Third-party_verification

    Third-party verification (TPV) is a process of getting an independent party to confirm that the customer is actually requesting a change or ordering a new service or product. By putting the customer on the phone (usually via transfer or 3-way call) the TPV provider asks a customer for his or her identity, that he or she is an authorized ...

  9. What do the numbers on your credit card mean? - AOL

    www.aol.com/finance/numbers-credit-card-mean...

    The security code: Security codes on credit cards are often referred to as card verification values (CVV) or card verification codes (CVC). These codes are three or four digits on their own, and ...