public function getSsoLink($writerId, $pid, $email)
    {
        $result = $this->getCommand('GetSSOLink', [
            'writerId' => $writerId,
            'pid' => $pid,
            'email' => $email
        ])->execute();
        if (!isset($result['ssoLink'])) {
            throw new ClientException('Getting SSO link failed. ' . (isset($result['error']) ? $result['error'] : ''));
        }
        return $result['ssoLink'];
    }