Cross-Platform Subscription Integration: A Developer Guide

Subscription billing across iOS, Android, and React Native is one of those problems that sounds straightforward until you actually start implementing it. Each platform has its own payment API, its own receipt format, its own edge cases around renewals, billing retries, and refunds. RevenueCat abstracts most of this pain away. This guide walks through the full implementation: SDK setup, fetching offerings, handling purchases, checking entitlements, and displaying paywalls. Working code for all three platforms. Project Setup iOS (Swift Package Manager) Add RevenueCat to your Xcode project via SPM: https://github.com/RevenueCat/purchases-ios.git Select both RevenueCat and RevenueCatUI packages. Minimum deployment target: iOS 13. Android (Gradle) In your app-level build.gradle.kts : dependencies { implementation ( "com.revenuecat.purchases:purchases:8.0.0" ) implementation ( "com.revenuecat.purchases:purchases-ui:8.0.0" ) } React Native npm install react-native-purchases react-native-purch