I'm a student and someone has asked me to build them an app. I should be capable although I need to determine Apple’s fees on transactions within the app. It's for a Fitness Personal Trainer. She wants to accept bookings and payments within her app. It’s a free app although I’m struggling to determine if Apple takes a cut when a client books in with her. Is it free because it’s a physical service or does it fall under the 30%/15%?