FOS\UserBundle\Model\UserInterface::getConfirmationToken PHP Method

    function getConfirmationToken();

 public function sendResettingEmailMessage(UserInterface $user)
 {
     $template = $this->parameters['template']['resetting'];
     $url = $this->router->generate('fos_user_resetting_reset', array('token' => $user->getConfirmationToken()), UrlGeneratorInterface::ABSOLUTE_URL);
     $context = array('user' => $user, 'confirmationUrl' => $url);
     $this->sendMessage($template, $context, $this->parameters['from_email']['resetting'], $user->getEmail());
 }