App development

I need with making an app
The app is an events app that allows businesses to post events and it rewards users for attending the events.
When businesses post events the app reserves credits on their account until the event is completed. But if they cancel the event, instead of just giving back the credits they have, the app adds more credits on top of it.
Please bubblers what do I need to get this app done?

What exactly are you asking? (what part of what you’ve described are you having trouble with?)