Ключевые слова: application, bill, business, buy, cash, cashless, code, coffee, communication, concept, connection, credit, customer, data, device, digital, display, electronic, hand, information, internet, mobile, money, online, pay, paying, payment, phone, price, product, qr, reader, receipt, retail, scan, scanner, scanning, screen, service, shop, smart, smartphone, store, technology, telephone, transaction, transfer, wallet, wireless,