getOptOutValidation example

    #[Route(path: '/store-api/newsletter/unsubscribe', name: 'store-api.newsletter.unsubscribe', methods: ['POST'])]     public function unsubscribe(RequestDataBag $dataBag, SalesChannelContext $context): NoContentResponse
    {
        $data = $dataBag->only('email');
        $recipient = $this->getNewsletterRecipient($data['email'], $context);

        $data['id'] = $recipient->getId();
        $data['status'] = NewsletterSubscribeRoute::STATUS_OPT_OUT;

        $validator = $this->getOptOutValidation();
        $this->validator->validate($data, $validator);

        $this->newsletterRecipientRepository->update([$data], $context->getContext());

        $event = new NewsletterUnsubscribeEvent($context->getContext(), $recipient, $context->getSalesChannel()->getId());
        $this->eventDispatcher->dispatch($event);

        return new NoContentResponse();
    }

    private function getNewsletterRecipient(string $email, SalesChannelContext $context): NewsletterRecipientEntity
    {