Get client secret for service
    :param client: Accounts Service API Client
    :param service_id: Service ID
    :return: Client secret (if available)

def _get_client_secret(client, service_id):
    """
    Get client secret for service
    :param client: Accounts Service API Client
    :param service_id: Service ID
    :return: Client secret (if available)
    """
    try:
        response = client.accounts.services[service_id].secrets.get()
    except httpclient.HTTPError as exc:
        if exc.code == 404:
            # If error is a 404 then this means the service_id is not recognised. Raise this error immediately
            msg = ('Service {} cannot be found.'.format(service_id))
            raise click.ClickException(click.style(msg, fg='red'))
        else:
            raise exc

    client_secrets = response['data']
    if client_secrets:
        return client_secrets[0]
    return None