Nothing wrong on my side, other websites accept my card. Tried for several hours, no luck Gaijin. Why?
You have to contact your bank. The new year occurred and banks can and will change rules for your account back to a default.
Gaijin is an EU company, so if you’re not EU you have to explicitly tell your bank to allow international purchases usually.
I am EU and I can pay with my card on other EU websites. Stop blaming the customer.