I bought a Prepaid Credit Card yesterday. Now, I had some problems with using it to donate to PayPal (how you donate to our server). Things to keep in mind:

DO NOT CONNECT TO A PAYPAL ACCOUNT

Register it at the site it specifies to make it valid with donating to our PayPal account.
(I got a Visa sponsored by Gift2Go, so it told me to go to gift2go.net and register it) After registered, you input the information you used to register it into the correct fields to donate.

Most importantly, put in the correct information!