Ключевые слова: adult, business, buy, cashier, caucasian, cell, checkout, communication, consumer, contact, contactless, customer, device, digital, electronic, field, hand, hotel, machine, male, man, mobile, mobilephone, money, near, nfc, pay, paying, payment, people, person, phone, retail, rfid, scan, shop, smart, smartphone, store, technology, terminal, transaction, transfer, wallet, wireless,