Webapp check-in discount option

The idea would be to be able to have the option of an item that is a discount for checking in online. Let's imagine that it is 1€ per person. If the establishment has it activated, it should be added to the reservation as a product at price -1€. In this way we give a clear reason for it to be used massively.

As in some cases the reservations will be 100% prepaid the text could be customizable to inform that it will be on account of consumption, etc.