What an interesting and voluminous question! :)

When booking a tour and paying for a tour there are a lot of nuances depending on what tour is booked - depth of sales, early departure, earlier booking or, so-called, burning tour, package tour or individual tour. And even if there are minor details, they can significantly affect the terms and amount of payments.

The contract with the service provider should specify the terms and amount of payment, penalties and conditions for the return of funds. For a more complete answer, you need to know the parameters of the tour to the smallest detail.

Have a nice rest!