Thats depends on the tour. In general you don’t have to pay anything in advance. You can pay cash at the day of the tour. Anyway sometimes we ask for a little fee in advance to block the reservation of a driver, a car or Van. If you make reservations for an Experience in Argentina like Iguazu Falls Experience, then you we will need to reserve the Airplane ticket in advance and some other administrative cost. This is why we are going to request some money in advance.