You can send either an email address or mobile device ID (IDFA) from Engage to Google as custom matchers. You can set an email address on the user profile by including `email` as a trait on an [`identify` call](/docs/connections/spec/identify/), as a property on a [`track` call](/docs/connections/spec/track/), or as an [external id](/docs/unify/identity-resolution/externalids/) for the user. If you use Segment’s mobile SDKs to collect events from a mobile app, the user’s IDFA is automatically captured. If you don't use Segment’s mobile SDKs, you can set the user’s IDFA by setting it within `context.device.advertisingId`. You are also required to collect `context.device.type` and `context.device.adTrackingEnabled` on the event payload. Additionally, ensure `android.idfa` and `ios.idfa` are enabled as identifiers in your [Identity Resolution settings](/docs/unify/identity-resolution/identity-resolution-settings/) in Engage.
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