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  2. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    The check digit is calculated by (()), where s is the sum from step 3. This is the smallest number (possibly zero) that must be added to s {\displaystyle s} to make a multiple of 10. Other valid formulas giving the same value are 9 − ( ( s + 9 ) mod 1 0 ) {\displaystyle 9-((s+9){\bmod {1}}0)} , ( 10 − s ) mod 1 0 {\displaystyle (10-s){\bmod ...

  3. 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.

  4. 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.

  5. Check digit - Wikipedia

    en.wikipedia.org/wiki/Check_digit

    Modulo 10 check digits in credit card account numbers, calculated by the Luhn algorithm. Also used in the Norwegian KID (customer identification number) numbers used in bank giros (credit transfer), Used in IMEI of mobile phones. Last check digit in EAN/UPC serialisation of Global Trade Identification Number . It applies to GTIN-8, GTIN-12 ...

  6. 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.

  7. 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 ...