AI-generated Key Takeaways
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This content describes a single operation (create or update) on a custom interest.
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The
update_maskfield is used to determine which resource fields are modified during an update operation. - 
          
The
operationfield can be eithercreateorupdate. - 
          
A
createoperation does not require a resource name, while anupdateoperation expects a valid resource name for the custom interest. 
A single operation (create, update) on a custom interest.
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                   FieldMask that determines which resource fields are modified in an update.  | 
              
Union field 
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                   Create operation: No resource name is expected for the new custom interest.  | 
              
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                   Update operation: The custom interest is expected to have a valid resource name.  |