Angular Route Guard & Squarespace APIs

Hello,

I have a web app that I control access to via Angular Route Guards. I'm looking to use my existing login functionality (and my apps customer database) to protect a squarespace site that I can host support documentation on.

Two questions:

1) Is this possible some easy way that I'm not thinking of?

2) Is there a way to fetch web pages via an API? (So I can have a user auth on my app and then fetch the appropriate squarespace hosted webpages after verifying creds)

**A key requirement is I don't want the data on the pages to be visible unless they have successfully authenticated to my app.