The type of mobile app vendor

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

| Enums ||
|---|---|
| ## `APPLE_APP_STORE` | Mobile app vendor for Apple app store. |
| ## `GOOGLE_APP_STORE` | Mobile app vendor for Google app store. |
| ## `UNKNOWN` | Used for return value only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |