How can I let my users watch Netflix, Prime video etc inside my webpage if they have accounts?

We are developing a website for users to be able to watch tv shows/movies together synchronously. We are aware of extensions such as Teleparty, Scener etc. We want to embed it within the site so that no one needs to install an extension. We have solely used Django because it was mandatory to use it.
Is there a way to do it? Or should we just develop an extension as well?

P.S: There is an app called Rave and they stream all of the aforementioned platforms and more through their apps (including Mac, Windows and Android). We are not sure how that is possible.

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