> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v24** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/ApplicationInstanceEnum.ApplicationInstance).

Possible application instances sending the request.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v24/enums/application_instance.proto)

| Enums ||
|---|---|
| ## `DEVELOPMENT_AND_TESTING` | The instance is for development and testing purposes. |
| ## `PRODUCTION` | The instance is for production purposes. |
| ## `UNKNOWN` | The value is unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |