> [!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/CustomAudienceService/MutateCustomAudiences).

<button default="" value="grpc">gRPC</button> <button value="rest">REST</button>

| ### MutateCustomAudiences |
|---|
| `` rpc MutateCustomAudiences(`MutateCustomAudiencesRequest`) returns (`MutateCustomAudiencesResponse`) `` Creates or updates custom audiences. Operation statuses are returned. List of thrown errors: [AuthenticationError](https://developers.google.com/google-ads/api/reference/rpc/v23/AuthenticationErrorEnum.AuthenticationError.md.txt) [AuthorizationError](https://developers.google.com/google-ads/api/reference/rpc/v23/AuthorizationErrorEnum.AuthorizationError.md.txt) [CustomAudienceError](https://developers.google.com/google-ads/api/reference/rpc/v23/CustomAudienceErrorEnum.CustomAudienceError.md.txt) [CustomInterestError](https://developers.google.com/google-ads/api/reference/rpc/v23/CustomInterestErrorEnum.CustomInterestError.md.txt) [FieldError](https://developers.google.com/google-ads/api/reference/rpc/v23/FieldErrorEnum.FieldError.md.txt) [FieldMaskError](https://developers.google.com/google-ads/api/reference/rpc/v23/FieldMaskErrorEnum.FieldMaskError.md.txt) [HeaderError](https://developers.google.com/google-ads/api/reference/rpc/v23/HeaderErrorEnum.HeaderError.md.txt) [InternalError](https://developers.google.com/google-ads/api/reference/rpc/v23/InternalErrorEnum.InternalError.md.txt) [MutateError](https://developers.google.com/google-ads/api/reference/rpc/v23/MutateErrorEnum.MutateError.md.txt) [OperationAccessDeniedError](https://developers.google.com/google-ads/api/reference/rpc/v23/OperationAccessDeniedErrorEnum.OperationAccessDeniedError.md.txt) [PolicyViolationError](https://developers.google.com/google-ads/api/reference/rpc/v23/PolicyViolationErrorEnum.PolicyViolationError.md.txt) [QuotaError](https://developers.google.com/google-ads/api/reference/rpc/v23/QuotaErrorEnum.QuotaError.md.txt) [RequestError](https://developers.google.com/google-ads/api/reference/rpc/v23/RequestErrorEnum.RequestError.md.txt) [Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v23/services/custom_audience_service.proto) |

Authorization scopes

:   Requires the following OAuth scope:

    - `https://www.googleapis.com/auth/adwords`

    For more information, see the [OAuth 2.0 Overview](https://developers.google.com/identity/protocols/OAuth2).