How to connect WordPress to ActiveCampaign database?

I am developing a website for a company on WordPress. Their old client/contact database was with WildApricot. They wanted to now use ActiveCampaign as a hosting service, and I've since exported all our our client/contact data to ActiveCampaign. Now here's the problem. The ActiveCampaign database has all of our client information, including passwords, emails, and profile information. What I am trying to do is create a new connection in WordPress to ActiveCampaign, but I am unsure of how to do this. I understand the gist of it, but cannot find any information on how to get database information for ActiveCampaign. Stuff like, DB name, host, etc. so I can use that in a new wpdb class. Keep in mind my PHP is limited, as I haven't had much exposure to it.