Ключевые слова: app, application, bar code, bill, budgeting, business, buy, caf, check, code, consumerism, customers, cyberspace, digital, discount, document, get, hand, information, menu, mobile, money, online, paying, payment, phone, photo, picture, price, product, qr, qr code, receipt, receive, recording, retail, sale, save, scan, scanner, scanning, screen, sharing, smart, smartphone, take, technology, touch, tracking, use,