Implementing In-App Billing in .NET MAUI

In-app purchases look simple — “user taps button, purchase succeeds” — but production billing means security, synchronization, entitlements, and platform abstraction. This guide designs a scalable billing layer for MAUI that keeps store complexity out of your UI.

What you’ll learn

• How Google Play Billing, StoreKit, and the Microsoft Store differ, and why you should never call store APIs directly from the UI
• A layered architecture: UI → IInAppBillingService → platform providers, using Plugin.InAppBilling
• Handling the three product types — consumables, non-consumables, and subscriptions
• Wiring the billing service into MAUI dependency injection and a StoreViewModel
• Why local validation is dangerous and how to do proper server-side receipt validation for iOS and Android
• Restoring purchases, managing entitlements, offline strategies, and common pitfalls like blocking the UI thread or forgetting DisconnectAsync()

A great reference if monetization is on your roadmap and you want to get the architecture right the first time.