Additional information about the application/tool issuing the request. This field is only used by [ContentCreatorInsightsService], [AudienceInsightsService], and [ReachPlanService] APIs.
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 The unique identifier of the agency proprietary application. This identifier is generated by Google. Reach out to your Google representative to request an application_id for each new application being integrated.  | 
              
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                   The instance type of the application sending the request.  |