This is a bit of a cross post. RosarioSIS, a fork of CentreSIS/FocusSIS has a project on github, and a webservices integration using xml-rpc.
This and other info at https://moodle.org/mod/forum/discuss.php?d=279913
It can be a good starting point if someone is looking for sample code and installation/configuration documentation. I haven't audited it, and it is not bullet-proof, but it may be the inspiration somebody needs...
Web services
RosarioSIS has webservices-based integration to Moodle
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