code: function cancelOrder(account, sequence, secret, options, callback) {
    var transaction = createOrderCancellationTransaction(account, sequence);
    var converter = TxToRestConverter.parseCancelOrderFromTx;
    transact(transaction, this, secret, options, converter, callback);
  }
docs: Cancel an order in the ripple network
  
  @url
  @param {Number String} request.params.sequence
  - sequence number of order to cancel
  
  @query
  @param {String "true"|"false"} request.query.validated
  - used to force request to wait until rippled has finished
  validating the submitted transaction