# 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

# configure()

A static method that configures the Superwall SDK with your API key.

> **Note:** This method is typically called once in your app's initialization, such as in your `main()` function or during app startup.

## Purpose

Configures the Superwall SDK with your API key and optional configuration settings.

## Signature

## Tab

```dart Flutter
static Superwall configure(
  String apiKey, {
  PurchaseController? purchaseController,
  SuperwallOptions? options,
  Function? completion,
})
```

## Tab

```swift iOS
static func configure(
  apiKey: String,
  purchaseController: PurchaseController? = nil,
  options: SuperwallOptions? = nil,
  completion: ((Result<Void, Error>) -> Void)? = nil
)
```

## Tab

```kotlin Android
fun configure(
  application: Application,
  apiKey: String,
  purchaseController: PurchaseController? = null,
  options: SuperwallOptions? = null,
  completion: ((Result<Unit>) -> Unit)? = null
)
```

## Parameters

<TypeTable
  type="{
  apiKey: {
    type: &#x22;String&#x22;,
    description: &#x22;Your Superwall API key from the dashboard.&#x22;,
    required: true,
  },
  purchaseController: {
    type: &#x22;PurchaseController?&#x22;,
    description: &#x22;Optional custom purchase controller.&#x22;,
    default: &#x22;`null` to use the default controller&#x22;,
  },
  options: {
    type: &#x22;SuperwallOptions?&#x22;,
    description: &#x22;Optional configuration options.&#x22;,
    default: &#x22;`null` for default settings&#x22;,
  },
  completion: {
    type: &#x22;Function?&#x22;,
    description: &#x22;Optional callback called when configuration completes.&#x22;,
  },
}"
/>

## Returns / State

Returns a `Superwall` instance that is immediately configured and ready to use.

## Usage

Basic configuration:

```dart
import 'package:superwallkit_flutter/superwallkit_flutter.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  Superwall.configure('pk_your_api_key_here');
  
  runApp(MyApp());
}
```

With options:

```dart
void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  final options = SuperwallOptions(
    paywalls: PaywallOptions(
      shouldPreload: true,
      automaticallyDismiss: false,
    ),
    logging: Logging(
      level: LogLevel.debug,
    ),
  );
  
  Superwall.configure(
    'pk_your_api_key_here',
    options: options,
  );
  
  runApp(MyApp());
}
```

With completion callback:

```dart
void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  Superwall.configure(
    'pk_your_api_key_here',
    completion: () {
      print('Superwall configuration completed');
    },
  );
  
  runApp(MyApp());
}
```