It looks like their profile pages are public, e.g. https://www.codecademy.com/scriptAce74322 -- but there's not an obvious way to get that as structured data, I mean, from a very little bit of googling and poking at the page source.
So the first step is figuring out if there's a way to get that profile / progress info as structured data of some kind (e.g. json or xml). Either through an official api, or an rss feed or something. An RSS feed would actually be great because you can hook that into an IFTTT recipe and send it on over to Beeminder probably without any further coding.
If it's not possible to get that from them as json, it'd still be possible to scrape the profile page since they're public (e.g. grab the url and run it through an html parser and grab just the element that you want), but that tends to be pretty unstable, because people be changing the structure of their html pages all the time.
Step 1: find the json/rss