# 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

# register()

A function that registers a placement that can be remotely configured to show a paywall and gate feature access.

## Purpose

Registers a placement so that when it's added to a campaign on the Superwall Dashboard, it can trigger a paywall and optionally gate access to a feature.

## Signature

```kotlin
fun Superwall.register(
    placement: String,
    params: Map<String, Any>? = null,
    handler: PaywallPresentationHandler? = null,
    feature: () -> Unit,
)
```

```kotlin
fun Superwall.register(
    placement: String,
    params: Map<String, Any>? = null,
    handler: PaywallPresentationHandler? = null,
)
```

## Parameters

<TypeTable
  type="{
  placement: {
    type: &#x22;String&#x22;,
    description: &#x22;The name of the placement you wish to register.&#x22;,
    required: true,
  },
  params: {
    type: &#x22;Map<String, Any>?&#x22;,
    description: &#x22;Optional parameters to pass with your placement. These can be referenced within campaign rules. Keys beginning with `$` are reserved for Superwall and will be dropped. Arrays and nested maps are currently unsupported and will be ignored.&#x22;,
    default: &#x22;null&#x22;,
  },
  handler: {
    type: &#x22;PaywallPresentationHandler?&#x22;,
    description: &#x22;A handler whose functions provide status updates for the paywall lifecycle.&#x22;,
    default: &#x22;null&#x22;,
  },
  feature: {
    type: &#x22;() -> Unit&#x22;,
    description: &#x22;A completion block representing the gated feature. It is executed based on the paywall's gating mode: called immediately for **Non-Gated**, called after the user subscribes or if already subscribed for **Gated**.&#x22;,
    required: true,
  },
}"
/>

## Returns / State

This function returns `Unit`. If you supply a `feature` lambda, it will be executed according to the paywall's gating configuration, as described above.

## Usage

## Tab

```swift iOS
func pressedWorkoutButton() {
  // remotely decide if a paywall is shown and if
  // navigation.startWorkout() is a paid-only feature
  Superwall.shared.register(placement: "StartWorkout") {
    navigation.startWorkout()
  }
}
```

## Tab

```kotlin Android
fun pressedWorkoutButton() {
  // remotely decide if a paywall is shown and if
  // navigation.startWorkout() is a paid-only feature
  Superwall.instance.register("StartWorkout") {
    navigation.startWorkout()
  }
}
```

## Tab

```dart Flutter
void pressedWorkoutButton() {
  // remotely decide if a paywall is shown and if
  // navigation.startWorkout() is a paid-only feature
  Superwall.shared.registerPlacement('StartWorkout', feature: () {
      navigation.startWorkout();
  });
}
```

## Tab

```typescript React Native
// remotely decide if a paywall is shown and if
// navigation.startWorkout() is a paid-only feature
Superwall.shared.register({
  placement: 'StartWorkout',
  feature: () => {
    navigation.navigate('LaunchedFeature', {
      value: 'Non-gated feature launched',
    });
  } 
});
```

Register without feature gating:

```kotlin
Superwall.instance.register(
    placement = "onboarding_complete",
    params = mapOf("source" to "onboarding"),
    handler = this
)
```