code: protected MultivaluedMap<String, String> getPerPageQueryParam(int perPage) {
          return (new GitLabApiForm().withParam(PER_PAGE_PARAM, perPage).asMap());
      }
docs: Creates a MultivaluedMap instance containing the "per_page" param.
  
  @param perPage the number of projects per page
  @return a MultivaluedMap instance containing the "per_page" param