AI-generated Key Takeaways
- 
          The document provides a list of services within the Ad Manager API, each linked to its documentation. 
- 
          It defines the ApiVersionError.Reasonenumeration, which includesUPDATE_TO_NEWER_VERSIONandUNKNOWNvalues.
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          The UPDATE_TO_NEWER_VERSIONreason indicates an operation is not allowed in the current API version.
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          The UNKNOWNreason is used when the actual value of an enumeration is not exposed by the requested API version.
- Namespace
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               https://www.google.com/apis/ads/publisher/v202508
| Enumeration | Description | 
|---|---|
| UPDATE_TO_NEWER_VERSION | Indicates that the operation is not allowed in the version the request was made in. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |