Please check the following:
- Any misspelling when entering your credit card information.
- Your bank hasn't blocked the transaction for some reason.
If it still fails, please try again in a few hours. It might be a banking system problem and it should be solved in a few hours.
If it still fails, does your name include non-English characters? Try completing the information only with English characters and see if it goes through this time.
If none of the above work, please call for assistance.