Ключевые слова: 2530 years, bill, business, button, buying, cafe, caucasian, code, coffee cup, communication, convenience, credit card, credit card reader, customer, customer service, day, day light, daytime, ease, handing, hold, holding, indoors, men, no face, pass, pin, push, restaurant, security, sitting, small business, standing, table, technology, terminal, two people, waiter, woman, worker,