A transaction can be blocked either by the bank, or by the risk profile of the merchant.
The most frequent reason is that Adyen receives a negative response from the bank. This can have multiple causes: the card number or CVC is incorrect, the amount exceeds your limit or foreign currencies are not accepted on your card. If the problem persists and you want to know why your transaction is refused, contact your issuing bank for the specific reason.
The other case for refusal can be on the merchant's side. Merchants set up risk profiles to avoid fraud. Your transaction may be flagged as fraud by this safety mechanism. If the transaction is marked incorrectly as fraud, please contact the merchant directly. If the merchant requires assistance to resolve this issue, they can contact us.