setConfirmUrl example

$systemConfig->set('core.loginRegistration.doubleOptInRegistration', true);
        $systemConfig->set('core.loginRegistration.confirmationUrl', '/confirm/custom/%%HASHEDEMAIL%%/%%SUBSCRIBEHASH%%');

        /** @var EventDispatcherInterface $dispatcher */
        $dispatcher = $this->getContainer()->get('event_dispatcher');

        $this->addEventListener(
            $dispatcher,
            CustomerConfirmRegisterUrlEvent::class,
            static function DCustomerConfirmRegisterUrlEvent $event): void {
                $event->setConfirmUrl($event->getConfirmUrl());
            }
        );

        $caughtEvent = null;
        $this->addEventListener(
            $dispatcher,
            CustomerDoubleOptInRegistrationEvent::class,
            static function DCustomerDoubleOptInRegistrationEvent $event) use (&$caughtEvent): void {
                $caughtEvent = $event;
            }
        );