Setting up a Subscriptions service

Hello everyone,

I am currently setting up SaaS kit integration with my app. Can anyone guide me in which is the best way to do this.

Here's a couple of doubts:

Should I set up a new database to hold the tables related to the SaaS Kit integration or should they all go on the same database been used.

Should I let the subscriptions be a separate rails app?

Should I just hold everything on the same app and database?