@canusfeminacanis In China I used to go to a restaurant that had a QRcode on each table. Customers could order at the counter on arrival. But we could also scan the QRcode to order and pay digitally, and the meal would be delivered to our table.

Don't know what tech was involved. But it was very helpful when they were busy, allowing them to spend less time taking orders and processing payments, and more time cooking and busing tables.