Membership carry across sites?

GeoDirectory Team,

This is a little off topic but is directly related to a need I have with GeoDirectory. I notice that you carry memberships between wpgeodirectory.com and wpinvoicing.com very well. At the same time, you have a blog post describing your journey to host BuddyPress on a subdomain and still carry memberships across.

Could you describe in a bit more detail about how or what plugins you are using to do this?

While I know multisite does not allow for this directly, I am still curious.

On a separate note, it would be great if we had the ability to place all the “business owner” functionality under a subdomain, leaving the “consumer” listing functionality under a main site. This would allow for the “business owner” site to have custom sales content, sales funnels and a less distracted listing management experience. At the same time, the “consumer” site could be very tailored for the end user. In my case, my “consumers” must be paid members to see all the details about a listing which is a bit confusing when having paid listings from “business owners” on the same site. Trying to funnel each user type is quite a balancing act.

Thanks in advance on sharing a little more about how you carry memberships across wpinvoicing.com and wpgeodirectory.com.

Tom