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Register the iOS version of your app in AppsFlyer.
1

Add an app

In AppsFlyer, open My Apps and choose Add app.
2

Choose iOS

Select iOS and add the app using the matching App Store details.
3

Confirm the app details

Make sure the app is associated with the same iOS app you publish through App Store Connect.
4

Find the AppsFlyer App ID

Open App Settings → App ID for the new iOS app and copy the value. You will paste this into Rey when connecting AppsFlyer.
The AppsFlyer App ID is required for iOS in Rey. It is separate from your AppsFlyer Dev Key.