As stated in the API docs, you can create a link from your web site to automatically log users in to a Support Centre.
This seems to require that you redirect them to the "/login" URL.
It would be really great if you could specify a target page to redirect to. I.e. offer a deep-link to a specific page on the support centre, with the auto-login routine functionality.
Presumably this could simply be handled by specifying a "target-url" parameter in the request, and if it's missing simply default to the homepage.
Complete We've implemented this suggestion!