This type of problem is often caused by using a credit/debit card from a country other than the USA to pay for a product/service being sold from the USA. Credit card companies often prevent these kinds of transactions due to suspected fraud. They may prevent this specific charge or they may block your card completely. Usually, a phone call to your credit/debit card company or bank will fix this. Contact them to explain your purchase and ask them to unblock your card.

Another common problem is mistyping your credit/debit card number, expiration date, or CCV code. Be very careful to type correctly the digits from your card into the online form. And be careful of pasting an extra space, or leaving an extra space at the start of the field before pasting your number.

If you prefer, we can always arrange to accept your payment via bank transfer. We can also arrange to bill you in most major currencies. Please open a support ticket if you wish to pursue this option.