I've set up a multi-site Drupal installation. The main site is example.com and we also have a.example.com and b.example.com.
I own example.com, and I rent a.example.com out to Person A, and b.example.com out to Person B. They pay their site rent using the UberCart role-purchase feature on my site. I need a way to set up my site so that Person A and B can log into example.com and pay their site rent, and have the upgraded role transfer over to a.example.com and b.example.com as well, automatically so that after a month if Ubercart downgrades their role I don't have to go in and manually unassign them.
Things I've tried:
Shared users table. This doesn't work because I don't want Person A to be able to see people who have signed up for b.example.com and a shared user site means everyone can see everything.
Domain Access. This works ok but is really shaky, and I'm planning on moving up to z.example.com and onward in the future, so unless there's a way to keep things more separate than I was able to, I don't think this is feasible. For example, if each site has an 'about us' page then I would see 26 "About Us" pages from my uid=1 account. Additionally, I didn't see any way of separating the UberCart module as much as I would like. Ubercart Marketplace is a no-go because I'm not taking any commission like it was designed to do, and UC_Domain hasn't been upgraded to drupal 7 yet.
Account Sync. This seemed like the closest, but the plugin appears broken, I get tons of XML-RPC errors when I try it, and generally it doesn't work as described, and seems to only sync the first account before breaking. Google searching the errors brings back nothing apart from warnings that XMLRPC is potentially dangerous.
Bakery. This seems great but it doesn't share roles across subsites unfortunately. I've been trying to add that in, but before I spent the time I wanted to see if there's some other way that I can go about this
If anybody needs clarification on anything let me know, I really want to get this solved and can't find anything online.