code: public JsonResponse scheduleBlastFromTemplate(String template, String list, Date scheduleTime, Blast blast) throws IOException {
          blast.setCopyTemplate(template);
          blast.setList(list);
          blast.setScheduleTime(scheduleTime);
          return apiPost(blast);
      }
docs: Schedule a mass mail from a template
  @param template template name
  @param list list name
  @param scheduleTime schedule time for the blast
  @param blast Blast Object
  @throws IOException