Ключевые слова: app, application, bar, barcode, cashless, cell, code, communication, computer, concept, contactless, customer, data, digital, discount, ecommerce, electronic, hand, holding, id qr, identification, label, laptop, man, menu, mobile, online, pay, payment, phone, qr, qrcode, reader, retail, sales, scan, scanner, screen, service, smart, smartphone, stand, store, tablet, technology, touch, touchscreen, transaction, using, wallet,