AI-generated Key Takeaways
- 
          This document describes operations on an ad group bid modifier, including create, remove, and update. 
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          An update operation uses a update_maskto determine which fields are modified.
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          The operationfield can be one of three types:create,update, orremove.
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          Create operations do not require a resource name, while update and remove operations do. 
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          Remove operations expect a resource name in a specific customers/{customer_id}/adGroupBidModifiers/{ad_group_id}~{criterion_id}format.
A single operation (create, remove, update) on an ad group bid modifier.
| Fields | |
|---|---|
| 
 | FieldMask that determines which resource fields are modified in an update. | 
| Union field 
 | |
| 
 | Create operation: No resource name is expected for the new ad group bid modifier. | 
| 
 | Update operation: The ad group bid modifier is expected to have a valid resource name. | 
| 
 | 
 Remove operation: A resource name for the removed ad group bid modifier is expected, in this format: 
 |