Requires Craft 2.5+, running php 5.5.9+
In much the same way that the Craft core license check allow you to use the same license on testing domains, our license checks allow similar testing conditions.
The License checks only trigger a duplicate warning if the site is detected as running on non-matching public domain.
We run a few checks to see if the domain is non-public :
http://clientname.whitelisteddomain.com. Just get in touch to request a domain added to the white list.
Don't worry. We don't shut off your payment processing, or disable any functions. We'll display a warning to the users in the CP, along with prompting the admins to resolve the issue.
To resolve a license check fail, you just need to transfer a license to the current domain, and that's done in a single click in the the CP area.