A fixed fare is calculated at the start of the trip based on the expected miles and time for that route. For example, instead of an £8-12 estimate, customers will just see £10 and we will charge them exactly £10 at the end (assuming no waiting fees and no changes of destination).
Customers like predictability and they often choose Kapten because of this specific feature.
If a customer requests additional stops or a significant variation from the planned route, you should switch to a flexible ride to be compensated for the additional distance and time. Do not end and restart the ride.