How to get Kinde user id after a User creates their account?

If I want to create a record in my own database once a user creates an account using Kinde, how do I approach this? I want this to happen after a user registers an account. Should I use the Management API? And if so, will I have to build my own Sign Up UI, instead of being able to use the UI that Kinde provides after clicking <RegisterLink />?
Thanks