If the new ticket price is higher than the original ticket price, please use the payment tool when buying the ticket or the new ticket that is needed to pay the net payment in full, the original fare will be used to pay the account number when the bank returns the purchase ticket within the stipulated time.
If the new fare is lower than the original fare after the change of the sign, the difference will also be within the time required by the bank to return the purchase of tickets used in the Payment tool account, if the new ticket after the change is equal to the original fare, then do not need to deal with payment procedures, that is, in fact, 12306 to sign the free.
Need to explain is, in 12306 to sign the train ticket is only suitable for you have not taken the ticket, if the user has to take the ticket, need to go to the service window to deal with the change, can not be changed through 12306 website.