Hi there... apologies for very late response...
Here is the answer .. after installing the v7 package you should be able to do exactly mentioned above but the way to do it is
- go to reportico top level folder copy start.php to say user.php
- edit user.php and uncomment/change line
$reportico->external_user = "<CURRENT USER>";
$reportico->external_user = "joomla user";
or if you are passing in a user like "https://..../reportico/user.php?user=5 you can use
$reportico->external_user = $_REQUEST["user"];
So now you can use reportico against your joomla database for a given user...
Hope that helps let me know and ill try to be more responsive!!!