When placing an order for a free PP.UA domain or a trial hosting period, you may notice that the order is not processed immediately. On the right side of the order, there will be a small download icon, and when you hover your cursor over it there will be a notification about the requirement to connect a payment card.
Linking the card, in this case, is only necessary to confirm that it is not an automatic registration. The service itself remains free of charge.
Such a procedure is necessary to filter out bots and scammers who register domains en masse. In a way, it is equivalent to a "captcha". The account must have a verified email and a linked card to make sure it is a real client.
You can link a card to your account on the page 'Payment cards' – after that, the order will be created.
When you link the card 1 UAH will be blocked on the account for a while to check the validity of the card.