code: public GitlabBadge getGroupBadge(Integer groupId, Integer badgeId) throws IOException {
          String tailUrl = GitlabGroup.URL + "/" + groupId + GitlabBadge.URL
                  + "/" + badgeId;
          return retrieve().to(tailUrl, GitlabBadge.class);
      }
docs: Get group badge
  
  @param groupId The id of the group for which the badge should be retrieved
  @param badgeId The id of the badge that should be retrieved
  @return The badge with a given id
  
  @throws IOException on GitLab API call error