code: @SuppressWarnings("unchecked")
    public Paging<Category> execute() throws
            IOException,
            SpotifyWebApiException {
      return new Category.JsonUtil().createModelObjectPaging(getJson(), "categories");
    }
docs: Get a paging of {@link Category} objects.
  
  @return A {@link Category} paging.
  @throws IOException            In case of networking issues.
  @throws SpotifyWebApiException The Web API returned an error further specified in this exception's root cause.