We use Paypal (www.paypal.com) to accept credit/debit card payments for orders when paying online. Visa, Mastercard, American Express and Discover are all accepted by Paypal.
You do not need to have or need to sign up for a PayPal account in order to send payment via PayPal. I will send you an e-mail invoice from PayPal, the e-mail will have a link to PayPal's website, which will have instructions on how to complete your transaction.
*** You can also use the Buy Now button to pay if you have been given your total amount that is due.