AI-generated Key Takeaways
- 
          The webpage provides a comprehensive list of Google Ad Manager API services, including links to their respective documentation. 
- 
          The content focuses on the RequiredCollectionError.Reasonenumeration and its possible values.
- 
          The RequiredCollectionError.Reasoncan indicate that a required collection is missing, too large, too small, or that the value is unknown for the requested API version.
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202508
| Enumeration | Description | 
|---|---|
| REQUIRED | A required collection is missing. | 
| TOO_LARGE | Collection size is too large. | 
| TOO_SMALL | Collection size is too small. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |