Free order is not created (adding a card is required)
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. How to solve this you can find in the article "How to add a payment card in your NIC.UA account?"
Pick up a domain name you always dreamed of
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.