Custom Purchase Flows and Paywalls with RevenueCat on Android

RevenueCat’s Android Purchases SDK supports several subscription-purchase architectures that independently determine who renders the paywall and who completes the transaction, ranging from fully custom interfaces using PurchaseParams to RevenueCat-hosted paywalls with optional custom billing logic. Custom paywalls fetch offerings and packages, display localized product pricing, and rely on Google Play’s returned subscription options to determine trial and introductory-offer eligibility, while purchase callbacks and coroutine APIs distinguish user cancellations from actual errors and provide updated CustomerInfo for entitlement-based access control. Subscription plan changes require an old subscription ID and a deliberately selected StoreReplacementMode, as defaults such as WITHOUT_PRORATION can cause upgrades to take effect immediately without charging the user until the existing term ends; modes differ in timing, proration, billing-date treatment, store support, and suitability for upgrades or downgrades. RevenueCat’s Paywall UI can be customized through options, listeners, activity launchers, gating callbacks, custom variables, and result handling, while PaywallPurchaseLogic enables an app to use its own billing implementation but requires it to acknowledge purchases within Google Play’s deadline and handle completion logic that RevenueCat would otherwise manage. The guidance emphasizes selecting defaults intentionally, correctly handling deferred plan changes and entitlement status, and treating a cancelled checkout as a user decision rather than a purchase failure.

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