User ID

A usage analytics (UA) user ID is an identifier which is automatically attributed to a user who performs an action that results in a UA event. For an authenticated user, this is a human-readable identifier (typically the user’s email address). For an anonymous user, it defaults to the visitor ID.

The UA user ID is distinct from the user name, which is an actual name, and the visitor ID, which can track anonymous users and can be specified manually.

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