Circle SSO set up

I’m looking at integrating Circle into my Bubble app and have a couple of questions I hope the hive mind might be able to solve!!

  1. I’m reading through the set up guide (How do I integrate Circle with Bubble? | Circle Community) but all my log ins are through pop ups rather than a specific log in page, so is the SSO integration still possible?

  2. It’s asking me for a custom subdomain - does that mean it needs to be integrated only with my live database rather than my dev one?

  3. If a subdomain is set up eg “forum.mysite.com” can this be embedded on my site? (if that makes sense?)

Thanks!

Just a bump to see if anyone can help!