code: public JsonResponse cancelSend(String sendId) throws IOException {
          Map<String, Object> data = new HashMap<String, Object>();
          data.put(Send.PARAM_SEND_ID, sendId);
          return apiDelete(ApiAction.send, data);
      }
docs: Cancel a send that was scheduled for a future time.
  @param sendId
  @return JsonResponse
  @throws IOException