I'm building an app for a local cafe with Flutter.
My question is regarding in-app payments as they are quite confusing. The cafe already does a monthly membership that provides customers certain benefits. The app will be used to support charging customers for the membership as well as to buy items to pickup from the store. I'm reading a lot about in-app purchases and Apple/Google's 30% cut of app subscription fees. But this isn't a subscription to the app itself, its a service of the cafe. Will the sale of the monthly cafe membership fall be subject to those fees or am I able to avoid those?