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  2. Credit card - Wikipedia

    en.wikipedia.org/wiki/Credit_card

    A credit card register is a transaction register used to ensure the increasing balance owed from using a credit card is enough below the credit limit to deal with authorization holds and payments not yet received by the bank and to easily look up past transactions for reconciliation and budgeting.

  3. Credit card imprinter - Wikipedia

    en.wikipedia.org/wiki/Credit_card_imprinter

    The device works by placing the customer’s credit card into a bed in the machine, then layering carbon paper forms over the card. A bar is slid back and forth over the paper to create an impression of the embossed card data and the merchant information on the imprinter.

  4. Telephone slamming - Wikipedia

    en.wikipedia.org/wiki/Telephone_slamming

    Telephone slamming is an illegal telecommunications practice, in which a subscriber's telephone service is changed without their consent. Slamming became a more visible issue after the deregulation of the telecommunications industry in the mid-1980s, especially after several price wars between the major telecommunications companies.

  5. Mobile payment - Wikipedia

    en.wikipedia.org/wiki/Mobile_payment

    Alternative monetization option in countries where credit card usage is low; One of the drawbacks is that the payout rate will often be much lower than with other mobile payments options. Examples from a popular provider: 92 percent with PayPal; 85 to 86 percent with credit card

  6. Card-not-present transaction - Wikipedia

    en.wikipedia.org/wiki/Card-not-present_transaction

    A card-not-present transaction (CNP, mail order / telephone order, MO/TO) is a payment card transaction made where the cardholder does not or cannot physically present the card for a merchant's visual examination at the time that an order is given and payment effected.

  7. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/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.

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