At this stage outside of Bulgaria, you can make a payment only through PayPal.

PayPal is an online payment service that allows you to pay securely, easily and quickly in online stores - and it's free of charge for the buyer.
- Sure: Your bank or credit card information is only stored in PayPal. Therefore, they are not sent over the Internet again with each online purchase.
- Easy: You will pay in two clicks. Because we rely on the PayPal-provided bank information for your credit card.
- Fast: PayPal payments arrive quickly. Then we can send the goods immediately.

More about the PayPal shopping rules can be found on their official website -
Terms of PayPal - Help Topics.

Paying your order via PayPal implies that you are already registered with PayPal. If you are not yet registered there, you can do it for free at at any time.
Registering your credit card in PayPal allows you to use it for payment on many world-famous internet sites.

Once you click "Buy Now" you will be redirected to the PayPal page where you will need to confirm the purchase.

If you are already a PayPal customer, you can access your user data and confirm the payment. If you are new to PayPal, you can either register as a guest or open a PayPal account and then confirm the payment.
If you send the goods back, the amount will be credited back to your PayPal account.