| ### MutateCustomAudiences | |---| | `` rpc MutateCustomAudiences(`https://developers.google.com/google-ads/api/reference/rpc/v26/MutateCustomAudiencesRequest`) returns (`https://developers.google.com/google-ads/api/reference/rpc/v26/MutateCustomAudiencesResponse`) `` Creates or updates custom audiences. Operation statuses are returned. List of thrown errors: [AuthenticationError](https://developers.google.com/google-ads/api/reference/rpc/v26/AuthenticationErrorEnum.AuthenticationError) [AuthorizationError](https://developers.google.com/google-ads/api/reference/rpc/v26/AuthorizationErrorEnum.AuthorizationError) [CustomAudienceError](https://developers.google.com/google-ads/api/reference/rpc/v26/CustomAudienceErrorEnum.CustomAudienceError) [CustomInterestError](https://developers.google.com/google-ads/api/reference/rpc/v26/CustomInterestErrorEnum.CustomInterestError) [FieldError](https://developers.google.com/google-ads/api/reference/rpc/v26/FieldErrorEnum.FieldError) [FieldMaskError](https://developers.google.com/google-ads/api/reference/rpc/v26/FieldMaskErrorEnum.FieldMaskError) [HeaderError](https://developers.google.com/google-ads/api/reference/rpc/v26/HeaderErrorEnum.HeaderError) [InternalError](https://developers.google.com/google-ads/api/reference/rpc/v26/InternalErrorEnum.InternalError) [MutateError](https://developers.google.com/google-ads/api/reference/rpc/v26/MutateErrorEnum.MutateError) [OperationAccessDeniedError](https://developers.google.com/google-ads/api/reference/rpc/v26/OperationAccessDeniedErrorEnum.OperationAccessDeniedError) [PolicyViolationError](https://developers.google.com/google-ads/api/reference/rpc/v26/PolicyViolationErrorEnum.PolicyViolationError) [QuotaError](https://developers.google.com/google-ads/api/reference/rpc/v26/QuotaErrorEnum.QuotaError) [RequestError](https://developers.google.com/google-ads/api/reference/rpc/v26/RequestErrorEnum.RequestError) [Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/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).