AI-generated Key Takeaways
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The document lists various services available in the Ad Manager API, including services for managing ad rules, adjustments, inventory, and reporting.
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The
NotNullError.Reasonprovides specific enumeration values indicating why a null error occurred, such as arguments being null or an unknown reason. - 
          
The descriptions for the
NotNullError.Reasonenumerations provide details about the potential causes of these errors within the API. 
The reasons for the target error.
- Namespace
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https://www.google.com/apis/ads/publisher/v202508 
| Enumeration | Description | 
|---|---|
                        ARG1_NULL
                      | 
                     Assuming that a method will not have more than 3 arguments, if it does, return NULL | 
                        ARG2_NULL
                      | 
                     |
                        ARG3_NULL
                      | 
                     |
                        NULL
                      | 
                     |
                        UNKNOWN
                      | 
                     The value returned if the actual value is not exposed by the requested API version. |