javascript ajax call to full product information

I am trying to display the filter setting of the products on my website, but the information is not part of the theme {{ product.xxx}}.
I opted to try reach it through ajax, but it is not located on the my own website...
third try, to reach it on api.shoplightspeed.com, but I am having trouble which I concluded is a CORS issue.
Any suggestions on how to get the filter information?