This usually happens when you pay by credit/debit card.

1. Your bank card may not have e-banking functionality. Please contact your local bank service centre for more details.

2. Your bank card may be limited to certain regions. Please try another bank card.

3. Your bank card may be expired, invalid, reported lost or have insufficient funds. Please contact your local bank service centre for further details.

4. It may happen that the external payment system has a data transfer discrepancy. Please refresh the website and try again later.

5. It may happen that your account has a payment amount limit. Please contact your payment solution service centre to inquire about an alternative solution, e.g. temporarily increasing quotas.

6. It may happen that the website is facing peak payment time. Please close the site and try your payment again later.

If your payment is still invalid, you can try other payment methods or use the more convenient and secure PayPal payment!