> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v23** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/Recommendation.CustomAudienceOptInRecommendation).

The Custom Audience Opt In recommendation.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v23/resources/recommendation.proto)

| Fields ||
|---|---|
| ## `keywords[]` | `KeywordInfo` Output only. The list of keywords to use for custom audience creation. |