OK. So far I have moved the domains into one profile and it went smoothly.
I have also initiated the registration transfer procedure. All that I have left to do is to pay. I am trying to do that right now, but I do not see an option to pay with "credits" and while it says that I can pay using PayPal or Credit Card I see no option to do that, just with Bitcoin etc. I can highlight the PayPal/Credit card option with a mouse-over, but clicking on it does nothing.
Have I missed something?