Please contact your credit card issuer/bank at their 24/7 phone number and ask them for the reason they are not authorizing your payment to www.joomlapolis.com .
They will be able to tell you and normally to fix the issue within minutes, so that you can just re-try.
Sometimes they block international payments until you call, but they can block for a variety of reasons. They can tell you the reason for sure.
Alternatively, as last resort, you can pay through Paypal and 2Checkout, as "backup payment methods", you can use a credit card there without creating accounts there
