public function getSPEntityConfiguration($entityID)
    {
        $url = $this->buildUrl(self::API_IDP . '?entityID=' . $entityID);

        $request = (new RequestDescriptor())
            ->setMethod('GET')
            ->setUrl($url);

        $response = $this->send($request);

        $extractor = (new MessageExtractor())->setHydrator(new MessageHydrator());

        /** @var SignedMessageDecorator $message */
        $message = $extractor->extract(\json_decode($response->getBody(), true));

        return $message->getMessage();
    }