Public train order status. pre_check=validation; to_be_paid=awaiting payment; to_be_confirmed=awaiting confirmation; processing=in progress; completed=completed; failed=failed and refunded; rejected=rejected and refunded; canceled=canceled and refunded; closed=expired; failed_reimbursing=failed and refunding; reimbursing=refund in progress; reimbursed=refunded; reimbursing_ticket_diff=change or ticket-price difference refund in progress.