public function getNotifiableEntityIdentifiers(NotifiableEntity $notifiableEntity)
    {
        $discoveryNotifiables = $this->getDiscoveryNotifiables();
        foreach ($discoveryNotifiables as $notifiable) {
            if ($notifiable['class'] === $notifiableEntity->getClass()) {
                return $notifiable['identifiers'];
            }
        }
        throw new \RuntimeException('Unable to get the NotifiableEntity identifiers. This could be an Entity mapping issue');
    }