How to make add class booking system functionality to an app?

Dear community, I was wondering if anyone has had experience with tools available to design booking systems for classes. we have a dance society and would like to try and make an app for it so students can register, buy and pay through the app.

My vision is the following: student can register and log-in. They can then buy one of the pass deals (10-class, 20-class, month pass, etc..)

The classes are based on drop in sessions and if students buy a 10class pass, this would update on their account. They would then come into the classes, we would scan a QR code on their phone and this would retract one class from the total on their account. 

This data would be stored and updated on our website database.

Any thoughts, suggestions would all be appreciated. 

Thank you