Frontend\Modules\Mailmotor\Actions\Unsubscribe::execute PHP Method

    public function execute()
    {
        parent::execute();
        // Define email from the unsubscribe widget
        $email = $this->getEmail();
        // Create the form
        $form = $this->createForm($this->get('mailmotor.form.unsubscription'), new Unsubscription($email, FRONTEND_LANGUAGE));
        $form->handleRequest($this->get('request'));
        if (!$form->isValid()) {
            $this->tpl->assign('form', $form->createView());
            if ($form->isSubmitted()) {
                $this->tpl->assign('mailmotorUnsubscribeHasFormError', true);
            }
            $this->loadTemplate();
            $this->parse();
            return;
        }
        /** @var Unsubscription $unsubscription */
        $unsubscription = $form->getData();
        try {
            // The command bus will handle the unsubscription
            $this->get('command_bus')->handle($unsubscription);
            // fallback for when no mail-engine is chosen in the Backend
        } catch (NotImplementedException $e) {
            $this->get('event_dispatcher')->dispatch(NotImplementedUnsubscribedEvent::EVENT_NAME, new NotImplementedUnsubscribedEvent($unsubscription));
        }
        return $this->redirect(FrontendNavigation::getURLForBlock('Mailmotor', 'Unsubscribe') . '?unsubscribed=true' . '#mailmotorUnsubscribeForm');
    }