Hi
There is a Problem processing some Mastercard payments via 2checkout payment gateway. if your payment is getting failed, please use payment method as "PayPal" and use your Mastercard to pay via Paypal.
it is not mandatory for you to have or open a PayPal account to make payment via PayPal - just select option "Don't Have a PayPal account? - Pay with your debit or credit card as a PayPal guest" in PayPal page to make payment as a guest.
Regards
Szerda, November 7, 2012