AI-generated Key Takeaways
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This page describes operations on a custom interest, specifically creation and update.
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The
update_maskfield is used to specify which resource fields are modified during an update operation. - 
          
The
operationfield can be eithercreatefor a new custom interest orupdatefor an existing custom interest with a valid resource name. 
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.  |