RevenueCat for React Native & Expo

Description

Implement RevenueCat in-app purchases and subscriptions in React Native and Expo apps with react-native-purchases and react-native-purchases-ui — dev-build requirement, configuring once with per-platform public SDK keys from environment, Test Store keys for development, identity sync with your auth (logIn/logOut on user change), a reactive entitlement hook with CustomerInfo listeners, fetching offerings and packages, purchase and restore flows with cancellation handling, RevenueCat paywalls (presentPaywall, presentPaywallIfNeeded, Paywall component), Customer Center, error codes, native debug logs, and testing via Test Store, iOS sandbox, and Play license testers. Use whenever an Expo or React Native app adds subscriptions, a paywall, premium gating, restore purchases, or manage-subscription UI with RevenueCat, or debugs empty offerings or purchases not unlocking.