I've built a tiny FB app whose purpose is to get the user's public profile URL. I have used the client-side authentication example provided, and it works just fine. I have also setup an application on Facebook.com so I can provide an APP ID. For this use, I have left App Domains blank, and made the app the type "Website with Facebook Login". And then I supply the "Site URL", the callback.
My trouble is that my web application runs across multiple domains. Individual customers have their own unique subdomain on our main domain. Do I have to create a new application for every single subdomain? It appears that way now, which would lead to hundreds — possibly thousands — of applications just to get a working callback URL for every customer domain.
Is there an easier way to do this?