Represents a bid-modifiable only criterion at the campaign level.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/resources/campaign_bid_modifier.proto)

| Fields ||
|---|---|
| ## `bid_modifier` | `double` The modifier for the bid when the criterion matches. |
| ## `campaign` | `string` Output only. The campaign to which this criterion belongs. |
| ## `criterion` Union field. The criterion of this campaign bid modifier. Required in create operations starting in V5. `criterion` can be only one of the following: ||
| ### `interaction_type` | `https://developers.google.com/google-ads/api/reference/rpc/v26/InteractionTypeInfo` Immutable. Criterion for interaction type. Only supported for search campaigns. |
| ## `criterion_id` | `int64` Output only. The ID of the criterion to bid modify. This field is ignored for mutates. |
| ## `resource_name` | `string` Immutable. The resource name of the campaign bid modifier. Campaign bid modifier resource names have the form: `customers/{customer_id}/campaignBidModifiers/{campaign_id}~{criterion_id}` |