# 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

# setIntegrationAttributes

Sets integration attributes for third-party analytics and attribution providers.

> **Info:** This method was introduced in version 4.8.1. It allows you to set attributes for third-party integrations like Amplitude, Mixpanel, and other analytics platforms.

## Purpose

Sets integration attributes that are sent to Superwall's servers and can be used for analytics and attribution tracking with third-party providers.

## Signature

```swift
public func setIntegrationAttributes(_ props: [IntegrationAttribute: String?])
```

## Parameters

<TypeTable
  type="{
  props: {
    type: &#x22;[IntegrationAttribute: String?]&#x22;,
    description: &#x22;A dictionary mapping integration attribute keys to their values. Use `nil` to remove an attribute.&#x22;,
    required: true,
  },
}"
/>

## Returns / State

This method returns `Void`. The attributes are stored and sent to Superwall's servers.

## Usage

Set integration attributes:

```swift
Superwall.shared.setIntegrationAttributes([
  .amplitudeUserId: "user123",
  .mixpanelDistinctId: "distinct456",
  .firebaseInstallationId: "abc123",
  .onesignalId: "onesignal-user-id",
  .custom("myCustomKey"): "customValue"
])
```

Remove an attribute by setting it to `nil`:

```swift
Superwall.shared.setIntegrationAttributes([
  .amplitudeUserId: nil  // Removes the amplitudeUserId attribute
])
```

Access current integration attributes:

```swift
let attributes = Superwall.shared.integrationAttributes
print("Current attributes: \(attributes)")
```

## IntegrationAttribute Types

Common integration attributes include:

* `.amplitudeUserId` - Amplitude user ID
* `.mixpanelDistinctId` - Mixpanel distinct ID
* `.firebaseInstallationId` - Firebase installation ID (4.10.8+)
* `.appstackId` - Appstack identifier (4.12.11+)
* `.singularDeviceId` - Singular device identifier (SDID) (4.15.4+)
* `.onesignalId` - OneSignal User ID (`onesignal_id`) for the user. Do not use the legacy OneSignal Player ID.
* `.custom(String)` - Custom attribute key

## Related

* [`integrationAttributes`](/docs/ios/sdk-reference/integrationAttributes) - Get current integration attributes
* [`Superwall.shared.integrationAttributes`](/docs/ios/sdk-reference/Superwall#integrationattributes) - Published property for integration attributes