Can I use this to synch accounts & user upgrades for members between sites? i.e. a member can log into site A and purchase a user upgrade, which will then also be active on site B
It's technically possible like what we did in the WordPress bridge but currently the API Consumer add-on doesn't have this functionality yet.
Sorry for getting back late. Yes, it is indeed possible. Especially with our XF2 api, you can do that between XF1 and XF2 too!
Am I understanding you correctly that its also possible to synch Account Upgrades? That is the feature this thread is about. i.e. if a member purchases an Account Upgrade on website 1 and they receive additional usergroup X, then also have the account upgrade active on website 2 so they get the same usergroup there.
Technically it does not sync the account upgrades itself but it syncs user groups. Which is basically the same thing.