code: public Photos getPhotos(String galleryId, EnumSet<JinxConstants.PhotoExtras> extras) throws JinxException {
      JinxUtils.validateParams(galleryId);
      Map<String, String> params = new TreeMap<>();
      params.put("method", "flickr.galleries.getPhotos");
      params.put("gallery_id", galleryId);
      if (!JinxUtils.isNullOrEmpty(extras)) {
        params.put("extras", JinxUtils.buildCommaDelimitedList(extras));
      }
      return jinx.flickrGet(params, Photos.class);
    }
docs: Return the list of photos for a gallery
  <br>
  This method does not require authentication.
  <br>
  Note: The Flickr documentation includes a per_page and page argument. However, galleries are limited to
  18 photos, and Flickr ignores the page and per_page parameters. Since they are not actually used, Jinx
  does not support them.
  <br>
  
  @param galleryId Required. The ID of the gallery of photos to return.
  @param extras    Optional. Extra information to fetch for the primary photo.
  @return photos in the gallery.
  @throws JinxException if required parameters are null or empty, or if there are any errors.
  @see <a href="https://www.flickr.com/services/api/flickr.galleries.getPhotos.html">flickr.galleries.getPhotos</a>