Using Sendy API to work with this AJAX form

Hey guys,

I'm trying to figure out how to make Sendy works with my landing page: http://chic.my (forked repo from https://github.com/scosman/betakit).

The app has its own referrals invitation and shared clicks system, I would like to keep it as is but integrates with Sendy through <form> tag. I'm not really technical so would appreciate some guide and pointers to get this to work using Sendy API.

Here's the js file for Betakit to process that form: https://github.com/scosman/betakit/blob/master/public/client/betakit.js

How do I use Sendy API to send it to Sendy newsletter page (http://newsletter.chic.my) but keep users at current http://chic.my page?

Thanks for your concern and time reading this!