A legacy app install ad that only can be used by a few select customers.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/common/ad_type_infos.proto)

| Fields ||
|---|---|
| ## `app_id` | `string` The ID of the mobile app. |
| ## `app_store` | `https://developers.google.com/google-ads/api/reference/rpc/v26/LegacyAppInstallAdAppStoreEnum.LegacyAppInstallAdAppStore` The app store the mobile app is available in. |
| ## `description1` | `string` The first description line of the ad. |
| ## `description2` | `string` The second description line of the ad. |
| ## `headline` | `string` The headline of the ad. |