# 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

# SuperwallDelegate

An abstract class that receives global SDK events for analytics and lifecycle management.

> **Info:** Use this delegate for global events across your entire app. For events specific to individual [`registerPlacement()`](/docs/flutter/sdk-reference/register) calls, use [`PaywallPresentationHandler`](/docs/flutter/sdk-reference/PaywallPresentationHandler) instead.

## Purpose

Receives global SDK events including paywall lifecycle, subscription changes, and custom actions.

## Signature

```dart
abstract class SuperwallDelegate {
  void subscriptionStatusDidChange(SubscriptionStatus newValue);
  void handleSuperwallEvent(SuperwallEventInfo eventInfo);
  void handleCustomPaywallAction(String name);
  void willDismissPaywall(PaywallInfo paywallInfo);
  void willPresentPaywall(PaywallInfo paywallInfo);
  void didDismissPaywall(PaywallInfo paywallInfo);
  void didPresentPaywall(PaywallInfo paywallInfo);
  void paywallWillOpenURL(Uri url);
  void paywallWillOpenDeepLink(Uri url);
  void handleSuperwallDeepLink(Uri fullURL, List<String> pathComponents, Map<String, String> queryParameters);
  void customerInfoDidChange(CustomerInfo from, CustomerInfo to);
  void userAttributesDidChange(Map<String, Object> newAttributes);
}
```

## Implementation

Extend the abstract class and implement the methods you need:

```dart
class MySuperwallDelegate extends SuperwallDelegate {
  @override
  void subscriptionStatusDidChange(SubscriptionStatus newValue) {
    print('Subscription status changed to: $newValue');
    // Update user interface, send analytics, etc.
  }
  
  @override
  void handleSuperwallEvent(SuperwallEventInfo eventInfo) {
    print('Superwall event: ${eventInfo.event}');
    // Send to your analytics platform
    Analytics.track(eventInfo.event.rawName, eventInfo.params);
  }
  
  @override
  void willPresentPaywall(PaywallInfo paywallInfo) {
    print('About to present paywall: ${paywallInfo.identifier}');
    // Pause video, hide overlays, etc.
  }
  
  @override
  void didDismissPaywall(PaywallInfo paywallInfo) {
    print('Paywall dismissed: ${paywallInfo.identifier}');
    // Resume video, show overlays, etc.
  }
  
  @override
  void handleCustomPaywallAction(String name) {
    print('Custom action triggered: $name');
    
    switch (name) {
      case 'contact_support':
        _openSupportChat();
        break;
      case 'share_app':
        _shareApp();
        break;
    }
  }
  
  @override
  void handleSuperwallDeepLink(Uri fullURL, List<String> pathComponents, Map<String, String> queryParameters) {
    print('Superwall deep link: $fullURL');
    print('Path: $pathComponents');
    print('Query: $queryParameters');
    // Handle deep link navigation
  }
  
  @override
  void customerInfoDidChange(CustomerInfo from, CustomerInfo to) {
    print('Customer info changed');
    // Sync with your backend, update UI, etc.
  }

  @override
  void userAttributesDidChange(Map<String, Object> newAttributes) {
    print('User attributes updated: $newAttributes');
    // Sync with analytics or update in-memory state.
  }
}
```

## Usage

Set up the delegate:

```dart
void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  await Superwall.configure('pk_your_api_key');
  
  // Set the delegate
  Superwall.shared.setDelegate(MySuperwallDelegate());
  
  runApp(MyApp());
}
```

Minimal delegate implementation:

```dart
class MinimalDelegate extends SuperwallDelegate {
  @override
  void subscriptionStatusDidChange(SubscriptionStatus newValue) {
    // Required: Handle subscription status changes
  }
  
  @override
  void handleSuperwallEvent(SuperwallEventInfo eventInfo) {
    // Required: Handle SDK events
  }
  
  // All other methods have default implementations
}
```