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  2. 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.

  3. What Do Credit Card Numbers Mean? - AOL

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

    A credit card number is the set of digits printed on either the front or back of a physical credit card. Credit card numbers are often 16 digits, but they can be as long as 19 digits or as short ...

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

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

    The numbers on a credit card help identify the credit card network, the company that issued the card and the cardholder. Credit card numbers are either 15 or 16 digits, with each digit having its ...

  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. 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 ...

  7. Want to Decode Your Credit Card Number? Check Out This ... - AOL

    www.aol.com/news/2011-02-11-want-to-decode-your...

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