Thank you for this plugin, just what we need.
On reviewing this for our network of sites, the settings page doesn't elaborate on the IPN path (unlike pro-sites which explicitly displays the IPM path e.g. http://.....com/wp-admin/admin-ajax.php?action=psts_pypl_ipn )
1. could you advise the correct path for appointments+
2. can you add the instructions to the settings page for a next release, as without it our subsites would need to ask for help on set up
Great work, WPMUDEV just gets better all teh time.