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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 U.S. Patent No. 2,950,048, granted on August 23, 1960.

3. AOHell - Wikipedia

   en.wikipedia.org/wiki/AOHell

   A fake account generator which would generate a new, fully functional AOL account for the user that lasted for about a month. This generator worked by exploiting the algorithm used by credit card companies known as the Luhn algorithm to dynamically generate apparently legitimate credit card numbers. The account would not be disabled until AOL ...

4. Best credit cards with buy now, pay later options - AOL

   www.aol.com/finance/best-credit-cards-buy-now...

   Here are a few of the best credit cards can can be an alternative to BNPL: U.S. Bank Visa® Platinum Card. Wells Fargo Reflect® Card. Citi Custom Cash® Card. But if you’re looking for a more ...

5. Types of rewards credit cards - AOL

   www.aol.com/finance/types-rewards-credit-cards...

   The Chase Freedom Unlimited® is a good example of a card with several bonus categories, offering: 5 percent cash back on travel purchased through Chase Ultimate Rewards. 5 percent cash back on ...

6. How credit card companies make money - AOL

   www.aol.com/finance/credit-card-companies-money...

   Key takeaways. Credit card companies generate most of their income through interest charges, cardholder fees and transaction fees paid by businesses that accept credit cards. Even if you don't pay ...

7. Authorization hold - Wikipedia

   en.wikipedia.org/wiki/Authorization_hold

   Authorization hold (also card authorization, preauthorization, or preauth) is a service offered by credit and debit card providers whereby the provider puts a hold of the amount approved by the cardholder, reducing the balance of available funds until the merchant clears the transaction (also called settlement), after the transaction is completed or aborted, or because the hold expires.