Universal API is here: https://www.nextscripts.com/snap-api/
It’s a separate product. WordPress SNAP Pro has embedded runtime edition of this API. It adds all networks to WordPress, but you can’t get the source and use it in your projects.
You need to obtain SNAP API Light or SNAP API Pro to get nxs-api.php file. If you got WordPress SNAP Pro plugin withing last year, you can get a discount: https://www.nextscripts.com/snap-api/upgrade/
