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  2. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    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. It is described in US patent 2950048A, granted on 23 August 1960. [1]

  3. Card security code - Wikipedia

    en.wikipedia.org/wiki/Card_security_code

    A card security code (CSC; also known as CVC, CVV, or several other names) is a series of numbers that, in addition to the bank card number, is printed (but not embossed) on a credit or debit card. The CSC is used as a security feature for card not present transactions, where a personal identification number (PIN) cannot be manually entered by ...

  4. Credit card information: The basics you need to know - AOL

    www.aol.com/finance/credit-card-information...

    A Card Verification Value (CVV), also called a security code, is the three-digit number located on the back of your credit card near the signature box, typically under the magnetic strip. If you ...

  5. What Is a Credit Card Security Code and Why Is It ... - AOL

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

    A card security code is a three- or four-digit number on the back of credit and debit cards that ensures the authenticity of transactions when a physical card is not presented at the point of sale ...

  6. Payment card number - Wikipedia

    en.wikipedia.org/wiki/Payment_card_number

    Payment card numbers are composed of 8 to 19 digits, [1] The leading six or eight digits are the issuer identification number (IIN) sometimes referred to as the bank identification number (BIN). [2]: 33 [3] The remaining numbers, except the last digit, are the individual account identification number. The last digit is the Luhn check digit.

  7. Get help with your AOL billing questions

    help.aol.com/articles/account-management...

    We have a billing verification process in place when a new charge occurs. As part of the process, we bill a temporary $1 authorization charge to the credit card submitted. This is used only to verify the validity of the credit card and because you must be at least 18 years of age to purchase an AOL service. The $1 charge won’t actually be ...