What do you use to process payments?
Namhost uses 2checkout.com to process credit card payments. 2checkout.com supports credit cards and many debit cards.
To pay by credit card, simply click on the link in the e-mail that was sent to you.
The e-mail should contain the invoice and the link opens it in your Internet browser. Once the invoice is open you can easily select "Credit Card" in the top left corner and then proceed to pay by Credit Card.