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Gather device IDs
Some analytics services need you to coordinate device and client IDs. This is necessary to prevent duplicate reporting.
Google Play Services Advertising Identifier
The Google Play Services Advertising Identifier (Google advertising ID) is a unique identifier for a device. Users can opt out of sharing their Google advertising ID by toggling the "Opt out of Ads Personalization" setting on their device. When a user has enabled this setting, the Adjust SDK returns a string of zeros when trying to read the Google advertising ID.
Important
:
com.google.android.gms.AD_ID
permission
to your app. If you do not add this permission, you will not be able to read the Google advertising ID even if the user has not opted out of sharing their ID.