A single campaign to book.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v24/actions/book_campaigns.proto)

| Fields ||
|---|---|
| ## `campaign` | `string` Campaign resource to book. Format: customers/{customer_id}/campaigns/{campaign_id} |
| ## `request_type` | `https://developers.google.com/google-ads/api/reference/rpc/v24/ReservationRequestTypeEnum.ReservationRequestType` Determines if the current request should book the inventory or hold it. |