Protected pages for Paypal, Stripe paying users ( subscriptions )

I think Builder.io should add this out of the box , not for private roles such as Admin or Author etc but for paying users which comes into the screen ,pay and then can see the protected pages ( such as a gallery , a playlist , a series of books etc ) , somekind of integration with a backend where to read boolean statuses ,json ,api i don't know even a Gsheet ,is it already within Builder.io or is it achievable, in this case can you create a tutorial for?Thanks