code: public UpdateRequest createUpdateRequest(long sheetId, UpdateRequest updateRequest) throws SmartsheetException {
          return this.createResource("sheets/" + sheetId + "/updaterequests", UpdateRequest.class, updateRequest);
      }
docs: Creates an Update Request for the specified Row(s) within the Sheet. An email notification
  (containing a link to the update request) will be asynchronously sent to the specified recipient(s).
  
  It mirrors to the following Smartsheet REST API method: POST /sheets/{sheetId}/updaterequests
  
  @param sheetId the Id of the sheet
  @param updateRequest the update request object
  @return the update request resource.
  @throws IllegalArgumentException if any argument is null or empty string
  @throws InvalidRequestException if there is any problem with the REST API request
  @throws AuthorizationException if there is any problem with  the REST API authorization (access token)
  @throws ResourceNotFoundException if the resource cannot be found
  @throws ServiceUnavailableException if the REST API service is not available (possibly due to rate limiting)
  @throws SmartsheetException if there is any other error during the operation