We allow you to use JFBConnect on unlimited domains for your own websites, so you can simply just purchase your subscription with this account in that case and continue to use JFBConnect for both sites.
However, if you are a website developer, we ask that you purchase a new subscription for each of your clients. In that case, I'd recommend making a separate account for your client on our sourcecoast.com site before purchasing again.
I hope this answers your question, but please let us know if you need more clarification.
-Melissa