@Vlad20
No worries. I think you can look at using "stripe". Have not used it myself as we have a mobile eftpos machine. I think you need to mark somewhere on the extranet that you need the CVC if you are going to use this system. You also need to be aware that the credit card numbers are only on the site for a short period of time after the reservation is made before they disappear.
I also think you can only access them 2 or 3 times before you are locked out. They will come back closer to the date of arrival but I have never paid attention to when as the numbers for our guests are stored in a specific password protected place for each booking through our channel manager and we can access them at any time.
If you do write down a guest credit card number make sure you keep it under lock and key. Destroy the number once the guest has checked out and you confirm there are no damages to charge.
I happen to love booking.com. If you set your listing up correctly it runs itself and we have had really great guests from them. Stick with it for a while and see how you go. Don't give up just yet.
Lisa