getBeforeConfirmSubscribeValidation example

    public function confirm(RequestDataBag $dataBag, SalesChannelContext $context): NoContentResponse
    {
        $recipient = $this->getNewsletterRecipient('hash', $dataBag->get('hash', ''), $context->getContext());

        $data = [
            'id' => $recipient->getId(),
            'status' => $recipient->getStatus(),
            'confirmedAt' => $recipient->getConfirmedAt(),
            'em' => $dataBag->get('em'),
        ];

        $this->validator->validate($data, $this->getBeforeConfirmSubscribeValidation(hash('sha1', $recipient->getEmail())));

        $data['status'] = NewsletterSubscribeRoute::STATUS_OPT_IN;
        $data['confirmedAt'] = new \DateTime();

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

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

        return new NoContentResponse();
    }