My linux still gets blocked if the query is not for a travel on the same day, but in future

I booked it on Europe’s best rail website - bahn.de

Definitely not. Just last week it took me over an hour to book a train on bahn.de. I needed multiple tries as I was constantly being flagged as bot - even though I was logged in and I had windows as browser user agent. Linux is being blocked by default. The payment options are Paypal, Card payment with Mastercard or Visa and Open banking by Tink (Visa). No European payment options.

The only reason to book with bahn.de is because they have cheap tickets. The website is garbage.

The offline payment is the most ambitious and the most attractive feature of D€ from consumer (no data transfer to PSP) and retail perspective (no PSP fees). It’s also one of the few Tech domains where European companies have leading positions. Giesecke+Devrient from Munich have been pre-selected to implement offline D€. They already have working offline payment products, see their Filia.