I'm sorry, I really don't understand anything now.
What do you want to pay for and to whom?
Or what did you really want or want?
You said you bought a new computer with Windows 10 installed, meaning you already paid for it and Windows 10 is available and paid for on your computer. The only thing is that the person who installed it only activated the features of the Home version. Now you wanted the Pro version features. Is it so? If so, enable these settings.
You have already paid for it, what else do you want to pay?
And if you really want to pay, you don't have to ask anyone for permission?
I'm sorry, I really don't understand what you wanted to know then?
OK, pay whoever you want and exactly as much as you want, it's up to you, but again - what you asked in your first post is already on your computer, and if you bought a new computer, you've already paid for it. There is even more things, for what You have already paid and about what You most likely don't know.
Good bye, good luck.