Request message for `https://developers.google.com/google-ads/api/reference/rpc/v25/ReservationService/BookCampaigns`.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/services/reservation_service.proto)

| Fields ||
|---|---|
| ## `customer_id` | `string` Required. The ID of the customer making the request. |
| ## `operation` | `https://developers.google.com/google-ads/api/reference/rpc/v25/BookCampaignsOperation` The operation to book the campaigns. |