code: public function retrieveMedia($id, $includeChildren = false, CachePolicy $cachePolicy = null)
          {
              $parameters = [
              'query' => ['includeChildren' => $includeChildren],
              'body' => json_encode([], JSON_UNESCAPED_UNICODE),
              'headers' => [],
          ];
  
              $result = $this->get('v1/media/' . $id . '', $parameters, $cachePolicy);
              $result = new MediaResponse($result);
  
              return $result;
          }
docs: Fetches a specific Media.
  
  @param int         $id              the Media identifier
  @param bool        $includeChildren includes children in the media
  @param CachePolicy $cachePolicy     a custom cache policy used for this request only
  
  @return MediaResponse