Buy ticket 3 month in advance possible to print out?

If you would like to buy the ticket three months in advance, we can only provide you with an e-invoice, which can only prove that you have booked the train ticket with us, but it does not mean that your ticket is confirmed. As far as we know, what is needed to apply for a Chinese visa is a confirmed ticket. We can provide the issued tickets to our clients who purchase tickets 30 days (one month) in advance. Therefore, I suggest you consult the Chinese embassy first about whether the e-invoice is applicable or not for your visa application. Thank you.