public function onDeliveryCreated(DeliveryCreatedEvent $event)
    {
        $delivery = $this->getResource($event->getDeliveryUri());

        $proctoredByDefault = $this->isProctoredByDefault();

        $delivery->editPropertyValues($this->getProperty(ProctorService::ACCESSIBLE_PROCTOR), (
        $proctoredByDefault ? ProctorService::ACCESSIBLE_PROCTOR_ENABLED : ProctorService::ACCESSIBLE_PROCTOR_DISABLED
        ));
    }