I have tried multiple times with multiple ways to purchase the game, first try i received the cant use CC for 24 hours, on my first attempt. then tried paypal, wont go through i receive the same error as you guys. im think its the website itself or something wrong with purchasing.
Normally this would be something you can discuss with Mojang since its regarding purchase orders.
The only thing I can gather is that your other PC was blocking a script from being used while making the purchase, thus coming back as failed orders because they were taking too long to process or wouldn't at all.
I tried CC, didnt work, then tried bank account transfer on paypal, didnt work. Finally transfered funds to paypal from bank account. The funds are right there on my paypal account ready to buy something AND THAT'S NOT EVEN AN OPTION FOR PAYMENT!!! WTF!!!???
!!!!!!!!!!!!EVERYONE!!!!!!!!!!!!!!! I had this problem when I bought the game!!!! What you need to do is contact your card holder or bank and allow them to pay for your game INTERNATIONALLY!!! The game is sold in Europe!!!
If you live within the state of Illinois, the Moneybookers website lists this location as "coming soon". Some users have reported success by selecting a different state during the purchasing process. Alternatively, prepaid cardsare now available in US retail stores, and are coming soon to European stores.