1. Check that the correct card payment method is selected
2. If the card is already linked (a mask is shown in the interface), try entering the data again
3. Contact the support of the issuing bank - most likely, the payer’s card does not support confirmation via 3D-secure, and for our payment partner this is a mandatory condition. Ask the bank to connect 3DS for this card. If this is not possible, you will have to use another card.
4. If everything is ok with the bank, try making a payment for a smaller amount
If it passed, it makes sense to write in support of Boosty. If it doesn’t pass, the card is not accepted by the payment partner and, unfortunately, they won’t be able to help here.