Can my ghost website membership database be updated from Stripe?

So, let’s say I have a bunch of members on a non-ghost platform. I have all their subscription details in Stripe and I’ve connected my ghost site to stripe as well. It seems doable to migrate:

OLD PLATFORM STRIPE INFO ----> GHOST PLATFORM STRIPE

What isn’t obvious is what happens when one of those migrated users comes to my website and tries to login. Does my ghost website maintain it’s own separate database? Or is adding a member in stripe the same as adding them to my ghost platform?

There are several variables that can affect how this works out, but you’ll likely want to import those members into Ghost: