Design a mobile calendar application that allows clients to see available music studio hourly times, book, and pay for the time via their mobile device. Login via social media, payments via cc, google pay, paypal, etc. Follow up report on actual time used and billed, with the difference being credited or debited from the customers initial payment method. Include a real-time work order that the customer can see the starting and ending of their sessions. Additional note sections for technical requirements and upload option to cloud for needed deliverable to complete their session.
This is kind of like booking.com for a hotel that bills hourly after we know how much time the client has used.