This card should have worked and I tried with two different ones.
Hmm... Error with Transaction
Unfortunately, the payment was not successful.
The error was: Your card was declined.

Hello David,
Thank you for your question about your credit card charge. All the card handling is handled by the card processor; we do not intervene in any way. The issue is almost always the expiration date on the card.
Please let us know if you have any other questions, or require other assistance. We are happy to help.