AI-generated Key Takeaways
- 
          CustomFieldVisibility defines the visibility levels of a custom field within the Ad Manager API. 
- 
          The different visibility levels include UNKNOWN, API_ONLY, READ_ONLY, and FULL. 
- 
          API_ONLY fields are only visible through the API, while READ_ONLY fields are visible in the UI but only editable through the API. 
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          FULL visibility means the field is visible and editable in both the API and the UI. 
The visibility levels of a custom field.
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202508
| Enumeration | Description | 
|---|---|
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. | 
| API_ONLY | Only visible through the API. | 
| READ_ONLY | Visible in the UI, but only editable through the API | 
| FULL | Visible and editable both in the API and the UI. |