Physical one time in app purchases?

So, this is largely possible, just not entirely through native App Store / Google Play in-app purchases. Platform policy restricts those to digital goods and services, so the "$4/item" charge can't go through store billing directly.

That said, RevenueCat's Web Billing could be a good fit here. Since it operates outside Apple/Google's payment system, it doesn't carry that restriction. Your onboarding flow could be done via:

• App subscription (monthly or yearly) via native IAP, managed through RevenueCat
• Physical item purchase ($4/item) through a Web Billing checkout, which supports shipping address capture in the flow
• In-app "Store" for ad hoc orders, but this would be country dependent as it would have to be done outside the app and respect the latest ruling rules here and here (but also through Web Billing)

For the "yearly plan = free items" scenario, that could work well via a webhook. RevenueCat notifies your backend when the yearly subscription is purchased, and your backend triggers fulfillment. Where the subscription is for the digital service, the physical item is a bundled benefit.

Web Billing is RevenueCat's web-based checkout solution that lets you sell subscriptions and one-time purchases outside of the App Store and Google Play billing systems.

more context here

Other customers with hardware + app subscription businesses have already shipped something like this model, so you should be able to mimic it too.

Amazing! Thank you!