Based on the documentation, it seems pretty straightforward to do redirect someone to a route other than the origin for an app. Per the documentation here, it says:
This almost works. After signin, I’m redirected to the custom path I supply with the auth token still appended. Then the app redirects back to the origin. I can’t find anything in my code that is causing this, so I’m wondering if the redirectToSignIn parameters are working properly. Has anyone got this working?