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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. 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.

4. Credit card - Wikipedia

   en.wikipedia.org/wiki/Credit_card

   Commons. Portal. v. t. e. A credit card is a payment card, usually issued by a bank, allowing its users to purchase goods or services or withdraw cash on credit. Using the card thus accrues debt that has to be repaid later. [1] Credit cards are one of the most widely used forms of payment across the world.

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

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

   Printed on a credit card, you'll find the card number, the cardholder’s name, when the card expires and the card's security code — all the details you need to make purchases online or in ...

6. Accepted payment methods for AOL services - AOL Help

   help.aol.com/articles/payment-methods-available-CS41

   Credit or debit cards• American Express • Visa (credit or debit) • Discover (credit or debit) • MasterCard (credit or debit) Direct debit is no longer available for active accounts, however, it can be used to pay past due balances, with a $7 fee. Entering your payment info. When adding a new payment method, keep the following in mind:

7. Tokenization (data security) - Wikipedia

   en.wikipedia.org/wiki/Tokenization_(data_security)

   Tokenization, when applied to data security, is the process of substituting a sensitive data element with a non-sensitive equivalent, referred to as a token, that has no intrinsic or exploitable meaning or value. The token is a reference (i.e. identifier) that maps back to the sensitive data through a tokenization system.

8. Add, edit, or delete a payment method for AOL services

   help.aol.com/articles/update-your-payment-method

   If your card number has changed, you must add a new card. 1. Sign in to your My Account page. 2. Click My Wallet. 3. Click Payment Methods. 4. Click Add Credit or Debit Card. 5. Enter the new info. 6. Click Submit.

9. Is it safe to give an app my credit card information? - AOL

   www.aol.com/finance/safe-app-credit-card...

   The bottom line. Popular credit card-based apps such as Uber, Lyft, Google Pay and DoorDash will ask for your credit card information for convenience of use. Considering there are standards that ...