When purchasing the trip, the tour operator must state the full price. They may not charge additional fees afterwards, such as for using your credit/debit card.

Administrative fees may exist, but the operator must clearly explain what they cover. If you are asked to pay additional charges beyond the amount of your order, you should be provided with an explanation for the surcharge. If this is unclear and you suspect it may be a hidden charge for credit/debit cards, ask the tour operator for an explanation.