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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. Credit card imprinter - Wikipedia

    en.wikipedia.org/wiki/Credit_card_imprinter

    Credit card imprinter. Manual card imprinter. A credit card imprinter, colloquially known as a ZipZap machine, click-clack machine or Knuckle Buster, is a manual device that was used by merchants to record credit card transactions before the advent of payment terminals. [ 1]

  4. Mastercard - Wikipedia

    en.wikipedia.org/wiki/Mastercard

    Australia also prohibited the no surcharge rule, a policy established by credit card networks like Visa and Mastercard to prevent merchants from charging a credit card usage fee to the cardholder. A surcharge would mitigate or even exceed the merchant discount paid by a merchant, but would also make the cardholder more reluctant to use the card ...

  5. Payment gateway - Wikipedia

    en.wikipedia.org/wiki/Payment_gateway

    A payment gateway is a merchant service provided by an e-commerce application service provider that authorizes credit card or direct payment processing for e-businesses, online retailers, bricks and clicks, or traditional brick and mortar. [1] The payment gateway may be provided by a bank to its customers, but can be provided by a specialised ...

  6. Can a business charge for using a credit card? - AOL

    www.aol.com/finance/business-charge-using-credit...

    When a business charges a fee for a form of payment, whether in person, online or by phone, it’s called a surcharge. Credit card surcharges are applied when you use your credit card to make a ...

  7. How credit card companies make money - AOL

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

    Credit card companies make money in a variety of ways. ... Many credit cards charge an annual fee to hold the card, representing an additional revenue stream for issuers.

  8. Get help with your AOL billing questions - AOL Help

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

    The $1 charge won’t actually be deducted from the account. The bank for the credit card should remove the charge within a day or two. If you used a credit card for age verification and noticed the charge hasn’t been removed after a few days, please contact your bank or credit card company.

  9. What you need to know to dispute a credit card charge - AOL

    www.aol.com/news/2010-04-29-what-you-need-to...

    There are three types of disputes consumers can use to seek to reverse charges: unauthorized use (typically as a result of credit card or identity theft), billing errors or substandard services or ...