Ключевые слова: app, application, bar, barcode, bill, business, buy, capture, cash, cellphone, code, coding, communication, connection, data, device, digital, discount, display, electronic, hand, holding, information, internet, isolated, mobile, mobile phone, money, online, pay, payment, person, phone, price, qr, qr code, qrcode, reader, retail, sale, scan, scanner, scanning, screen, service, smart, smartphone, tag, technology,