code: public boolean cancelMFSIP(String sipId) throws KiteException, IOException, JSONException {
          new KiteRequestHandler(proxy).deleteRequest(routes.get("mutualfunds.sip").replace(":sip_id", sipId), new HashMap<String, Object>(), apiKey, accessToken);
          return true;
      }
docs: Cancel a mutualfunds sip.
  @param sipId is the id of mutualfunds sip.
  @return returns true, if cancel sip is successful else exception is thrown.
  @throws KiteException is thrown for all Kite trade related errors.
  @throws IOException is thrown when there is connection related error.