The "Payment type" setting is located in the "Pricing" settings when creating or editing the service:
This parameter defines how the service cost would be charged in the reservation and what the total services amount would be:
"Per booking" means for each reservation, regardless of the number of rooms and nights. The service is provided only once. Total cost of service for all the rooms in a booking = price * 1 booking.
"Per room" means for each booked room, regardless of the number of nights. The service is provided only once. Total cost of room service = price * 1 room.
"Per person" means for each guest receiving the service, regardless of the number of nights. Total cost of room service = price * number of guests.
"Per room night" means for each booked room for each night. Total cost of room service = price * 1 room * number of nights.
"Per use" means the quantity of services provided. Total cost of room service = price * number of service.
"Per guest per night" means for each guest receiving the service, for each day. The service is applied for all guests selected on the booking engine. Total cost of room service = price * number of guests * number of nights.