1: Make sure all information is correct including credit card number, expiration date, CVV code and billing address.
2: Make sure you have enough credit or account balance.
3: Check whether your card authorized or default online transaction limit is too low.
4: Try refreshing the page, or logging completely out and then logging back in.
5: Start over with a new order instead of trying to pay for the same order over again.
6: If your payment is still declined, you may need to contact your bank.
As default in all Credit Card banks, part of their security, they block international transactions/payment. Unless the card holder will request to unblock their secured method.
7: If above is not working, please contact us at service@hyphotonflux.com or online chat.