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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.
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 ...
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]
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 ...
MIFARE. MIFARE is a series of integrated circuit (IC) chips used in contactless smart cards and proximity cards . The brand includes proprietary solutions based on various levels of the ISO/IEC 14443 Type-A 13.56 MHz contactless smart card standard.
A punched card is a flexible write-once medium that encodes data, most commonly 80 characters. Groups or "decks" of cards form programs and collections of data. The term is often used interchangeably with punch card, the difference being that an unused card is a "punch card," but once information had been encoded by punching holes in the card ...
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