/**
* HelloSignClient constructor.
* @param mixed $first email address or apikey or OAuthToken
* @param string $last Null if using apikey or OAuthToken
* @param string $apiUrl (optional) alternative api base url
* @param string $oauthTokenUrl
*/
public function __construct($first, $last = null, $apiUrl = self::API_URL, $oauthTokenUrl = self::OAUTH_TOKEN_URL)
{
parent::__construct($first, $last, $apiUrl, $oauthTokenUrl);
}
