I tried with paypal with multiple credit/debit cards, all declined. I contacted paypal and told me there's nothing wrong with my account, it's the seller that cancels the payments. I contacted fastspring directly 2 weeks ago then again a week ago when i tried again to make payment, then 1 hour ago when i tried again to make payment(and was declined again) and still haven't heard back from them! I contacted the support of beamng a week ago who replied that they sent a message to fastspring directly too to see if they reply this time. Haven't heard from beamng support since then which is a week ago. Has this happened to anyone else or am i just the unlucky one? lol.