> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v23** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/AdditionalApplicationInfo).

Additional information about the application/tool issuing the request. This field is only used by `ContentCreatorInsightsService`, `AudienceInsightsService`, and `ReachPlanService` APIs.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v23/common/additional_application_info.proto)

| Fields ||
|---|---|
| ## `application_id` | `string` 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. |
| ## `application_instance` | `ApplicationInstance` The instance type of the application sending the request. |