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2. Contactless payment - Wikipedia

   en.wikipedia.org/wiki/Contactless_payment

   EMV contactless symbol used on compatible payment terminals. EMV stands for "Europay, Mastercard, and Visa", the three companies that created the standard.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 ...

3. Contactless smart card - Wikipedia

   en.wikipedia.org/wiki/Contactless_smart_card

   A contactless smart card is a card in which the chip communicates with the card reader through an induction technology similar to that of an RFID (at data rates of 106 to 848 kbit/s). These cards require only close proximity to an antenna to complete a transaction.

4. Square (financial services) - Wikipedia

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

   Square charges $99 for Square Stand and $59 for its chip-based Square Reader. [55] The Square app is freely downloadable from the Apple App Store and the Google Play Store. Square charges a fee of 2.6% plus $0.10 on every electronically scanned credit card transaction [ 56 ] or 3.50% plus $0.15 per manually-entered transaction.

5. Proximity card - Wikipedia

   en.wikipedia.org/wiki/Proximity_card

   A proximity card or prox card [1] also known as a key card or keycard is a contactless smart card which can be read without inserting it into a reader device, as required by earlier magnetic stripe cards such as credit cards and contact type smart cards. [2] The proximity cards are part of the contactless card technologies.

6. Block, Inc. - Wikipedia

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

   In October 2011, the company stated that it was processing about US$2 billion per year in payments through its "Square" card readers, charging 2.75 percent per swipe. [ 45 ] In 2012, Starbucks and Square announced a partnership that would allow Starbucks to use the Square payment technology to accept payments for coffee.

7. MIFARE - Wikipedia

   en.wikipedia.org/wiki/MIFARE

   The maximal read/write distance between card and reader is 10 centimetres (3.9 in), but the actual distance depends on the field power generated by the reader and its antenna size. In 2010, NXP announced the discontinuation of the MIFARE DESFire (MF3ICD40) after it had introduced its successor MIFARE DESFire EV1 (MF3ICD41) in late 2008.