The treatment has a standard fee of 50 Euro.
It may be that the client wants to talk about other problems to the therapist at that time of later. That is possible after an appointment. The fee charged by the therapist will usually be 50 Euro per hour.
A last remark. There is at the moment a scarcity of statistical data regarding this treatment. The therapist who organizes this activity is trying to put together such data. He will include the results of the described activity in his publication unless you tell him that you object.