code: public GroupUrls getGroup(String groupId) throws JinxException {
      JinxUtils.validateParams(groupId);
      Map<String, String> params = new TreeMap<>();
      params.put("method", "flickr.urls.getGroup");
      params.put("group_id", groupId);
      return jinx.flickrGet(params, GroupUrls.class, false);
    }
docs: Returns the url to a group's page.
  
  This method does not require authentication.
  
  @param groupId NSID of the group to fetch the url for. Required.
  @return group NSID and URL.
  @throws JinxException if groupId parameter is missing, or if there are any errors.
  @see <a href="https://www.flickr.com/services/api/flickr.urls.getGroup.html">flickr.urls.getGroup</a>