Identifier for authenticated users. When the user signs in, you can get an identifier from your system and send it as authenticatedUserToken. This lets you keep using the userToken from before the user signed in, while providing a reliable way to identify users across sessions. Don't use personally identifiable information in user tokens. For more information, see User token.
Unique identifier for a search query. The query ID is required for events related to search or browse requests. If you add clickAnalytics: true as a search request parameter, the query ID is included in the API response.
Timestamp of the event, measured in milliseconds since the Unix epoch. By default, the Insights API uses the time it receives an event as its timestamp.