I have been trying to use paypal for the last 20 hours to buy the basic membership. After several "transaction failed" pop-ups, I called my credit card company and paypal. Both said that I should have no problem making a purchase. I tried a few minutes ago and still no luck. What gives?
I suggest you email support@cardhunter.com with your ingame username so the devs can check in on what might have gone wrong with any transactions.