public function search($username, $startAt = null, $maxResults = null, $includeActive = null, $includeInactive = null)
    {
        $parameters = array(
            'username' => $username,
            'startAt' => $startAt,
            'maxResults' => $maxResults,
            'includeActive' => $includeActive,
            'includeInactive' => $includeInactive
        );
        return $this->apiClient->callEndpoint(sprintf('%s/search', self::ENDPOINT), $parameters);
    }