Ключевые слова: app, application, bar, barcode, business, businessman, cash, cashless, checkout, code, commerce, communication, concept, customer, data, device, digital, hand, holding, identification, information, internet, isolated, menu, message, mobile, money, online, pay, pay qr code, payment, phone, price, product, qr, qrcode, quick, reader, retail, scan, scanner, screen, service, showing, smart, smartphone, store, technology, vest, white,