How to use the official xBox LIVE API?

Question

API

Task: to enable the user to log into the account using a Microsoft xbox account, get information about the xbox profile: his nickname and a list of games.
Problem: all the answers I found suggest that we use XBox creator Programs and we will be happy: but the official XBox LIVE SDK can only be used in UWP applications and other similar ones for developing games, in order to subsequently publish the program in the Microsoft Store. But this is not at all what is needed. I just want a normal restful api to get information.
https://docs.microsoft.com/en-us/windows/uwp/xbox-...
There is also Xbox Live REST endpoints - I didn't find the ones I needed in the list of provided methods.
You can't use the third party API, only the official one.
Question: how do you still get the necessary information about the profile?
Even if you use the official api, it asks for UXID, and Authorization token, where can I find them?
At least how to log in with xBox account? Or is it just a Microsoft Account and you can use the token after you log in to your Microsoft Account?
So many questions and so little information, maybe someone has already faced a similar task?

Answer 1

Yes, I have encountered. I read information from xbox live from perl scripts under linux using LWP. If the question is still relevant, write.