public function getLoginStartUrl($redirecturl) {
		$credentials = array(
			'identifier' => $this->options['consumer_key'],
			'secret' => $this->options['consumer_secret'],
			'callback_uri' => $redirecturl
		);

		$server = new \League\OAuth1\Client\Server\Xing($credentials);
		
		$this->temp_credentials = $server->getTemporaryCredentials();
    
		return $server->getAuthorizationUrl($this->temp_credentials);
	}