Points cards, and the one number you type

A points card suits a place where the bill is different every time. The default is one euro, one point, and the venue may set its own rate, a minimum spend and a cap for a single visit.

It never rounds up. A venue should never owe more than it said it would.

When you record the meal yourself from the counter card, what you send is not a meal: it is a request to record one. The venue sees it on their screen and can say it was not them. If nobody objects, it goes on your card the next day, so a venue that never opens the screen still honours it.

You can record once a day per venue at a restaurant. That is the venue's own setting, so a place that serves you twice in a day may allow a shorter wait, and the message tells you how long rather than just refusing.

Anything over a thousand euro is refused and you are asked to have the venue scan your card instead, which is the honest way to handle a bill that size.