AI-generated Key Takeaways
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An Ad Group Criterion Customizer provides a customizer value for a linked CustomizerAttribute at the AdGroupCriterion level.
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Key fields include the resource name, the linked customizer attribute, the status, the customizer value, and the associated ad group criterion.
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The resource name format is
customers/{customer_id}/adGroupCriterionCustomizers/{ad_group_id}~{criterion_id}~{customizer_attribute_id}. - 
          
The customizer attribute and ad group criterion fields are immutable, and the ad group criterion must be a keyword criterion.
 
A customizer value for the associated CustomizerAttribute at the AdGroupCriterion level.
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 Immutable. The resource name of the ad group criterion customizer. Ad group criterion customizer resource names have the form: 
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 Required. Immutable. The customizer attribute which is linked to the ad group criterion.  | 
              
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                   Output only. The status of the ad group criterion customizer.  | 
              
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                   Required. The value to associate with the customizer attribute at this level. The value must be of the type specified for the CustomizerAttribute.  | 
              
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 Immutable. The ad group criterion to which the customizer attribute is linked. It must be a keyword criterion.  |