Why doesn't the browser redirect after the success screen?

After a successful connection the widget only redirects to your endpoint if auth_success_redirect_url was passed in the body of your auth request.

After a successful connection the widget only redirects to your endpoint if auth_success_redirect_url was passed in the body of your auth request. Without it, the browser stays on the default success screen.

Also:

• Send the Content-Type: application/json header on the generateWidgetSession request. An Accept header alone is no longer sufficient after recent changes.

See customising authentication redirects for the full setup.