Connect my Prestashop Database to my Xenforo Database?

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Is there a way to connect my Prestashop Database to my Xenforo Database?

So I'm trying to create a session with a login to Prestashop that uses Replication to a slave database that gets inserted into the fields for my Xenforo 'database users, 'passwords',  and so on values so I can create a session ID and cookie to identify user is logged in and create fluidity between both websites. I already have the code for Xenforo to create session and set cookie and check for login status on the main website, but I don't know how to go about seeing if the Database Replication will work.

Can someone shed some light on this one?

Thanks so much!