Get data of User's XBOX account

I want to extract data from a user's Xbox account. i.e. I want to extract the user's summaries/profileStats/profileStats/UserStats or whatever Xbox calls it.

The process I followed:

I registered an application in Azure Portal. Then on my client (Angular), I authorize the user using the following endpoint:

https://login.live.com/oauth20_authorize.srf?client_id=${clientId}&approval_prompt=auto&response_type=code&scope=${scopes}&redirect_uri=${redirect}

I extract the code from this and then I am able to get the user's access token, refresh token and user_id using postman:

But I cannot find any resources to Xbox's Developer API. Thus I don't know which endpoints to call the get the User's information.

I have found OpenXBL, but it is not the official Xbox development API and I cannot figure out how to use it.

Thus what is the official Xbox Web API or can anyone provide me with an endpoint URL which to call to get a user's Xbox information?