The Schoology Discussion Comment PHP Sample Code by Schoology demonstrates how to comment on a group discussion. It requires POST method, URL request, and authorization header to display a "hi mom" text.
A few years ago when Brigham Young students wanted to create a site based on university data, they were forced to scrape the university's website. Now BYU has launched a university-wide API and is about to launch a developer portal. David Raths explains what the future holds for APIs at BYU.