> You go somewhere, you buy, at the end of your meal or whatever they tell you phone only, no card, no cash.
Note that this is likely illegal, even though I'm sure it's very common in certain places, and arguing about legal tender laws is not how you want to spend every meal of course.
But, in principle, in most countries at least, businesses and private citizens are obligated to accept the country's currency to discharge debts. They're free to have an upfront no cash policy, and refuse to do business with you if you try to pay with cash, for example making you leave all your groceries at the checkout counter. But if they claim that you have a debt to them, such as a meal you've already eaten and now must pay for, they must accept any form of the country's currency, such as cash, as a means of you paying that debt off.
Note that this is likely illegal, even though I'm sure it's very common in certain places, and arguing about legal tender laws is not how you want to spend every meal of course.
But, in principle, in most countries at least, businesses and private citizens are obligated to accept the country's currency to discharge debts. They're free to have an upfront no cash policy, and refuse to do business with you if you try to pay with cash, for example making you leave all your groceries at the checkout counter. But if they claim that you have a debt to them, such as a meal you've already eaten and now must pay for, they must accept any form of the country's currency, such as cash, as a means of you paying that debt off.