> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v23** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/AdGroupCriterionCustomizerOperation).

A single operation (create, remove) on a customizer attribute.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v23/services/ad_group_criterion_customizer_service.proto)

| Fields ||
|---|---|
| ## `operation` Union field. The mutate operation. `operation` can be only one of the following: ||
| ### `create` | `AdGroupCriterionCustomizer` Create operation: No resource name is expected for the new ad group criterion customizer. |
| ### `remove` | `string` Remove operation: A resource name for the removed ad group criterion customizer is expected, in this format: `customers/{customer_id}/adGroupCriterionCustomizers/{ad_group_id}~{criterion_id}~{customizer_attribute_id}` |