code: public function completeLogin($extrainputs = array()) {
  		if (!isset($extrainputs['oauth_token']) || $extrainputs['oauth_token'] == '') {
  			throw new \Exception('Xing oauth. Somethign went wrong. No token in the session');
  		}
  		
  		$credentials = array(
  			'identifier' => $this->options['consumer_key'],
  			'secret' => $this->options['consumer_secret']
  		);
  
  		$server = new \League\OAuth1\Client\Server\Xing($credentials);
  		
  		$this->access_token = $server->getTokenCredentials($this->temp_credentials, 
  			$extrainputs['oauth_token'], $extrainputs['oauth_verifier']);
  		
  		return $this->getUserProfile();
  	}
docs: Completes social login. Is caled after redirect from Xing auth page
  
  @param array $extrainputs List of POST/GET arguments names