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  2. Square (financial services) - Wikipedia

    en.wikipedia.org/wiki/Square_(financial_services)

    Square is a financial services platform by Block, Inc. for small and medium-sized businesses. [1] [2] It enables accepting credit card payments using smartphones as POS registers, and facilitates various business operations. As of 2023, Square reports 4 million merchant clients and an annual payment value of US$ 210 billion.

  3. Block, Inc. - Wikipedia

    en.wikipedia.org/wiki/Block,_Inc.

    Block, Inc. (formerly Square, Inc. [9]) is a U.S. listed company founded by Jack Dorsey and Jim McKelvey in 2009. It is a financial technology conglomerate. The company reportedly serves 56 million users and 4 million businesses, and processes payments worth US$ 228 billion annually as of 2023. [10] [11] [3]

  4. Contactless payment - Wikipedia

    en.wikipedia.org/wiki/Contactless_payment

    Contactless payment systems are credit cards and debit cards, key fobs, smart cards, or other devices, including smartphones and other mobile devices, that use radio-frequency identification (RFID) or near-field communication (NFC) for making secure payments. The embedded integrated circuit chip and antenna enable consumers to wave their card ...

  5. Card reader - Wikipedia

    en.wikipedia.org/wiki/Card_reader

    A card reader is a data input device that reads data from a card-shaped storage medium and provides the data to a computer. Card readers can acquire data from a card via a number of methods, including: optical scanning of printed text or barcodes or holes on punched cards, electrical signals from connections made or interrupted by a card's punched holes or embedded circuitry, or electronic ...

  6. Radio-frequency identification - Wikipedia

    en.wikipedia.org/wiki/Radio-frequency_identification

    Radio-frequency identification ( RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. An RFID system consists of a tiny radio transponder called a tag, a radio receiver, and a transmitter. When triggered by an electromagnetic interrogation pulse from a nearby RFID reader device, the tag transmits ...

  7. AOL Mail

    mail.aol.com

    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

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