If you are unable to pay during checkout, please first double-check the following:
1. Your name, address, and card details match
2. You have enough balance in the card to cover the exchange rate
3. Your card has not expired
If you are still having payment issues, then contact your bank.
In most cases, these transaction failures are caused by the bank's security systems blocking the payment to protect your account (for example, due to international transaction limits or fraud protection).