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The IFA (Identifier for Advertisers) is the platform-standard ad ID we forward with every ad request — IDFA on iOS, GAID on Android. The SDK reads it automatically; your app only needs the one-time platform configuration below. If no IFA is available (user denied permission, OS-level opt-out, web), the SDK falls back to a first-party identifier it generates internally — fill rate stays reasonable, but retargeting and frequency capping work better with a real IFA.

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iOS — IDFA + App Tracking Transparency

iOS 14+ requires user consent before any SDK can read the IDFA. The system prompt is App Tracking Transparency (ATT). Add the usage description to Info.plist: 
<key>NSUserTrackingUsageDescription</key>
<string>We use your advertising identifier to show you more relevant ads.</string>
Without this key, the app will crash on iOS 14+ as soon as the SDK requests ATT.
By default the SDK calls ATTrackingManager.requestTrackingAuthorization automatically the first time a session is created. To manage the prompt yourself (for example, delay it until after onboarding), set requestTrackingAuthorization: false on SessionOptions and supply the advertisingId you collected.
The ATT prompt only appears when the app is in an active state. Initializing the SDK before that — for example, in AppDelegate.didFinishLaunchingWithOptions — may suppress the prompt entirely.
The Swift SDK also reads IDFV (UIDevice.current.identifierForVendor) as a stable iOS-only secondary identifier. IDFV does not require ATT and is always available.

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Android — GAID + AD_ID permission

GAID is always available on Android — there’s no runtime consent prompt. Reading it requires the install-time com.google.android.gms.permission.AD_ID permission (Android 13+ / API level 33+). How the permission is declared depends on the SDK:
  • Kotlin SDK and React Native SDK — added automatically via manifest merger. No changes to your AndroidManifest.xml required.
  • Flutter SDK — declare it manually in android/app/src/main/AndroidManifest.xml: 
    <uses-permission android:name="com.google.android.gms.permission.AD_ID"/>
If your manifest has tools:node="remove" on the AD_ID permission anywhere (often a leftover from an older privacy-tightening pass), remove the override or the SDK can’t read GAID.

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Web

Browser environments don’t have an OS-level IFA. The React, Vue, and JavaScript SDKs don’t read or request one — they go straight to the first-party fallback identifier on every request.