We understand that you need to pay your invoice and right now we only accept bitcoin. Paying by bitcoin is safer for you and us. We know card details have been held by other providers in the past and we want to make everything safe for everyone. As an added bonus we are crediting extra time for paying with bitcoin also. We hope to accept cards again some time in the future. For now though you can follow this guide on how to get a wallet and purchase bitcoin and pay your invoice. https://sdsync.org/members/index.php?rp=/knowledgebase/64/How-To-Pay-With-Bitcoin.html
We also have video tutorials in our channel list under the INFO section on how to buy and send bitcoin.