Request message for the BookCampaigns action. Request including this operation can have a latency of up to 30 seconds. This feature is not publicly available.

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

| Fields ||
|---|---|
| ## `campaigns[]` | `https://developers.google.com/google-ads/api/reference/rpc/v26/BookCampaignsOperation.Campaign` Campaigns to book. Maximum 2 campaigns per request. |
| ## `quote_signature` | `string` If provided, the signature of the previous quote. Clients should always provide the quote signature from previous quotes if they haven't changed the campaigns to prevent price fluctuations within a user session. |