code: private void getTCerts() {
          GetTCertBatchRequest req = new GetTCertBatchRequest(this.member.getName(), this.member.getEnrollment(),
                  this.member.getTCertBatchSize(), attrs);
          try {
              List<TCert> tcerts = this.memberServices.getTCertBatch(req);
              // Add to member's tcert list
              for (TCert tcert : tcerts) {
                  this.tcerts.push(tcert);
              }
          } catch (GetTCertBatchException e) {
              // ignore the exception for now
          }
      }
docs: Call member services to get more tcerts