In Japan, many small restaurants / street food parlors have adopted this payment system : before to go in, or in before to seat, you choose your dish via the button, then immediatly pay it. You then receive your bill which is also your order bon that you will hand out to the waiter. There is then no more money exchange in the restaurant, no issues with clients not paying and a gain of time. But you rather don't want to ask question about the menu before to choose.
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