pub async fn add_entity_to_appointment(
    configuration: &Configuration,
    appointment_uuid: &str,
    entity_uuid: &str,
    x_access_token: Option<&str>,
    x_secret_token: Option<&str>,
    authorization: Option<&str>,
    ehelply_active_participant: Option<&str>,
    ehelply_project: Option<&str>,
    ehelply_data: Option<&str>
) -> Result<bool, Error<AddEntityToAppointmentError>>