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Why does China UnionPay always get message errors when booking train tickets online (3000000)?
Because of the software problem of root certificate and UnionPay payment, the message error is caused, mainly because the gateways on both sides are not well connected.

Solution:

Buy train tickets on another website.

Go to official website to download the latest plug-ins.

Go directly to the station to buy train tickets.

Change the payment method.

Sometimes this kind of mistake will heal automatically, and you can do it later.