code: public void deleteGroupBadge(Integer groupId, Integer badgeId) throws IOException {
          String tailUrl = GitlabGroup.URL + "/" + groupId + GitlabBadge.URL
                  + "/" + badgeId;
          retrieve().method(DELETE).to(tailUrl, Void.class);
      }
docs: Delete group badge
  
  @param groupId The id of the group for which the badge should be deleted
  @param badgeId The id of the badge that should be deleted
  @throws IOException on GitLab API call error