Passing user and course data to LMS using Javascript

My company is looking to switch to Articulate 360 from Adobe Captivate. We use a home built LMS that does not work with SCORM. Currently, we are able to pass user and course data from lessons to our LMS using Javascript. 

We have been told that Articulate cannot help us in figuring out how to do this since they do not support Javascript. We have also been told this might be difficult because Articulate does not publish a list of internal functions/variables that we can make use of.

Here's a list of our needs in order for us to move forward with Storyline:

• Include external JavaScript files.
• Ability to access and create Application Event Listeners.  This allows us to execute our code on certain events - Start up, Button Clicks, Course Completion, etc...
• Access URL or Form Data and store in system variables or local storage.  We will pass in User and Course data that will need to be included in the JS calls to our LMS.

We would greatly appreciate any help or direction. I know this is an unusual situation.