# Attribution (/docs/sdk/attribution)



The SDK attributes installs to the campaigns that drove them automatically — there's no additional wiring beyond [initializing it](/docs/sdk/installation). The platform-specific settings below tune how accurately that attribution resolves.

## iOS [#ios]

### App Tracking Transparency [#app-tracking-transparency]

On iOS, request **App Tracking Transparency (ATT)** permission after onboarding. Once the user consents, the SDK collects the IDFA automatically — you don't handle IDFA yourself. In Expo, add `expo-tracking-transparency` and set an `attUsageDescription` in the plugin config (see [Installation → Expo](/docs/sdk/installation)); on native iOS the SDK triggers the prompt through the standard ATT API.

### Clipboard attribution [#clipboard-attribution]

**Clipboard attribution** uses the clipboard to improve iOS install-attribution accuracy. When enabled, users see a brief paste notification when opening a link.

It's off by default and configured per app, not in code: open your project's **Events** screen in the Layers app, click the **gear icon**, and toggle **Clipboard Attribution** under **Settings**. It's available for iOS apps only.

## Android [#android]

Android uses **Install Referrer** for attribution — it's built into the SDK and needs no configuration or per-app setting. Clipboard attribution does not apply on Android.

## See also [#see-also]

* [Installation](/docs/sdk/installation) — per-platform setup, including the Expo ATT plugin config.
* [Tracking events](/docs/sdk/tracking-events) — the events that carry revenue and product context.
* [SDK health & verification](/docs/api/concepts/sdk-health) — confirm attribution and tracking are healthy.