We have two web applications. One is developed in Django, let's call it portal (oAuth2 provider). Another is developed in PHP, let's call it client.
We want to display a link for authenticated users on the portal website, so that by clicking the link the user is automatically signed in to the client website. No password asked, the client website should open and the user should be already signed in on the client website.
Is it possible to implement such a magic link using oAuth2 or we have to create our own solution?