You can make payment through your account credit (account balance).

How to do? When you place your order, you must select the "Use Credits" option to apply your account credit (account balance) to your cart amount. Then click "Proceed to Checkout", if you credit is lower cart amount, you have to pay the rest on Total amount.

How can I get account credit (account balance)? You must to buy Credits at https://shopkey.net/buy-credits.html. If you buy $100 on your credit, your account will be credited $100