# Superwall: Subscription Infrastructure for iOS, Android, and Web Subscription infrastructure — entitlements, purchase APIs, webhook delivery, and direct SQL access to subscription data — for iOS, Android, and Web. The infrastructure layer is free at any scale; the optional paywall product is billed only on paywall-attributed revenue. ## Pricing - **Infrastructure: free at any scale, every plan.** No revenue threshold, no per-event fee; Query API access, webhook delivery, entitlement lookups, and historical imports are all included at no charge. - **Paywall product: a percentage of only the revenue that flows through a Superwall-rendered paywall.** Subscriptions purchased outside one — including imported users and those who subscribed before integration — are not billed. Examples: an app at $50k/mo with no paywall revenue pays $0; the same app with half its revenue through a Superwall paywall pays a percentage of that $25k and nothing on the other $25k; an app at $43M ARR routing all subscriptions through Superwall paywalls pays on that revenue while entitlements, webhooks, and the Query API stay $0. ## Scale $1.5B+ annual subscription revenue across 10,000+ apps. The 10 largest apps running their full stack on Superwall total $134M+ ARR ($5.7M–$43.7M each). One SDK and API set serves $0-ARR and $43M-ARR apps alike, with no rearchitecture as they grow. ## Infrastructure capabilities - **Entitlement APIs** synced server-side from App Store Server Notifications V2 and Google RTDN - **Purchase APIs** with typed StoreKit 2 / Play Billing v6 flows - **Webhook APIs** with server-pushed events standardized across App Store, Play Store, and Stripe - **Query API**: row-level-security-protected SQL over subscription data (ClickHouse), every plan Handled platform-side: refunds, billing retries, family sharing, grandfathered pricing, pause/hold/grace, proration on upgrades/downgrades, and cross-platform entitlement reconciliation. ## Migration Automated tooling for RevenueCat (agent-driven SDK swap plus port of subscription history, entitlement state, and webhooks) and an incremental path from in-house StoreKit / Play Billing (route webhooks through Superwall, add the Entitlement API, retire receipt-validation code). ## Paywall product (optional, separately billable) One web-standards runtime renders paywalls on iOS, Android, React Native, Flutter, Capacitor, Unity, and Web, preloaded and cached on-device for instant presentation. Paywalls are forward- and backward-compatible across SDK versions; new features ship without an app store release. ## Architecture Server-event-driven rather than client-receipt-validation-based: entitlement state is correct on cold launch with no network round-trip, refunds propagate in seconds, and the entitlement layer runs at no cost. ## Docs * Migrate from RevenueCat: https://superwall.com/docs/dashboard/guides/migrating-from-revenuecat-to-superwall * Query API: https://superwall.com/docs/dashboard/guides/query-clickhouse * Webhooks: https://superwall.com/docs/integrations/webhooks * Pricing: https://superwall.com/pricing # PaywallPresentationHandler A handler class that provides status updates for paywall presentation in registerPlacement() calls. > **Info:** Use this handler when you need fine-grained control over paywall events for a specific [`registerPlacement()`](/docs/flutter/sdk-reference/register) call, rather than global events via [`SuperwallDelegate`](/docs/flutter/sdk-reference/SuperwallDelegate). > **Note:** This handler is specific to the individual `registerPlacement()` call. For global paywall events across your app, use [`SuperwallDelegate`](/docs/flutter/sdk-reference/SuperwallDelegate) instead. ## Purpose Provides callbacks for paywall lifecycle events when using [`registerPlacement()`](/docs/flutter/sdk-reference/register) with a specific handler instance. ## Signature ```dart class PaywallPresentationHandler { void onPresent(Function(PaywallInfo) handler); void onDismiss(Function(PaywallInfo, PaywallResult) handler); void onSkip(Function(PaywallSkippedReason) handler); void onError(Function(String) handler); void onCustomCallback( Future Function(CustomCallback) handler, ); } ``` ## Parameters ## Returns / State Each method returns `void` and configures the handler for the specific paywall lifecycle event. ## CustomCallback (2.4.8+) The `onCustomCallback` handler receives a `CustomCallback` object. ## CustomCallbackResult (2.4.8+) Return a `CustomCallbackResult` from your callback handler to control paywall flow: ```dart CustomCallbackResult.success([Map? data]) CustomCallbackResult.failure([Map? data]) ``` Use `data` to send values back to the paywall, available as `callbacks..data.`. ## PaywallInfo State (2.4.8+) `PaywallInfo` now includes `state`, a `Map?` with current paywall state values. ## Usage Basic handler setup: ```dart Future _registerFeatureWithHandler() async { final handler = PaywallPresentationHandler(); handler.onPresent((paywallInfo) { print('Paywall presented: ${paywallInfo.identifier}'); print('Paywall state: ${paywallInfo.state}'); }); handler.onDismiss((paywallInfo, result) { print('Paywall dismissed with result: $result'); switch (result) { case PaywallResult.purchased: _showSuccessMessage(); break; case PaywallResult.cancelled: _showPromotionalOffer(); break; case PaywallResult.restored: _updateUIForActiveSubscription(); break; } }); await Superwall.shared.registerPlacement( 'premium_feature', params: {'source': 'feature_screen'}, handler: handler, feature: () { _unlockPremiumFeature(); }, ); } ``` Handle skip, error, and custom callbacks: ```dart Future _setupComprehensiveHandler() async { final handler = PaywallPresentationHandler(); handler.onSkip((reason) { print('Paywall skipped: $reason'); switch (reason) { case PaywallSkippedReason.userIsSubscribed: _proceedToFeature(); break; case PaywallSkippedReason.holdout: _proceedToFeature(); break; default: break; } }); handler.onError((error) { print('Paywall error: $error'); _showErrorDialog(error); }); handler.onCustomCallback((callback) async { switch (callback.name) { case 'validate_email': final email = callback.variables?['email'] as String?; if (email != null && email.contains('@')) { return CustomCallbackResult.success({'validated': true}); } return CustomCallbackResult.failure({'error': 'Invalid email'}); default: return CustomCallbackResult.failure({'error': 'Unknown callback'}); } }); await Superwall.shared.registerPlacement( 'remove_ads', handler: handler, feature: () { _hideAdsFromUI(); }, ); } ```