Assign group by remote script

[petteyg359]

The host I run vB on is running PHP4. I have a script that requires PHP5 that retrieves information from from another source about a user's group (in a seperate application). I need to retrieve the output (true or false) of this PHP5 script to vB, and if it is true, add the user to a group (after checking to make sure they aren't already in it), if false, remove them (after checking to see if they've already been removed). I want the vB side to call it once every 24 hours (and whenever a new user registers) and check all users. The PHP5 script needs to be sent two profile variables. So:

1. Call myphp5site.org/myscript.php with profile variables field6 and field7 (via form method post?)
2. Check if member is in group "Verified".
3. If "Verified"=false and script=true, add member to "Verified".
4. If "Verified"=true and script=false, remove member from "Verified".

That should cover everything, right? How would I go about doing this?

One other question for a lsightly related mod/add-on/hack/whatever-it's-called. I assume a GPL license wouldn't work because you're using the product in a non-free way. If so, what's the closest license that is compatible with whatever license vB itself is?