Settings for Real-Time Bidding, a feature only available for campaigns targeting the Ad Exchange network.

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

| Fields ||
|---|---|
| ## `opt_in` | `bool` Whether the campaign is opted in to real-time bidding. |