You can also delete the payment token that was issued to that website.

My bank lists the currently valid recurrent tokens explicitly next to each card, and lets me revoke them individually (but I can also re-add a card to the merchant if I want to).

In the Revolut app it’s a bit wierder, you have to go to a card, tap on a past payment, and then you get a “block future payments” button that prevents that merchant from ever using that card, but there’s also a “subscription payment” toggle that only revokes the recurrent token for that particular payment.

The “block future payments” feature is severely limited on the free Revolut accounts, you can only do 3 blocks per month and can only have 5 total overall active. So you probably want to turn off the subscription toggle instead.