private function get(string $email, string $listId): array
    {
        try {
            /** @var Collection $result */
            $result = $this->api->request(
                'lists/' . $listId . '/members/' . $this->getHashedEmail($email),
                array(),
                'get'
            );

            // will return the one and only member array('id', ...) from Collection
            return $result->all();
        } catch (\Exception $e) {
            return [];
        }
    }