Ohk, I have used them and they work just fine, but what your looking for is an actual credit card, there is no company that offers those so you will have to get someone who has a card with 50 euros and they will cancel the card after using it, I highly doubt you will find anyone who can do this for you, unless you give them access to your account and they make the purchase for you and then remove the card after that.
dang, ok thanks for info. ill keep this topic up just in case someone wants to though.