I run a dance studio and am looking to design an app to streamline the scheduling and payment.  For payment, I would like the app administrator (me for my studio, the heads of the other studios) to be able to register students via the app (including their payment info) then when tuition is due, they can go ahead and initiate payment through the app.  On the scheduling end, the app would show when teachers are available for extra lessons and users can rsvp for classes via the app.