Hello! I'm migrating from Auth.js (Next-auth v5). My project currently has an authAdapter with a custom createUser function, which creates an org for a new user. This means that my db has a column: default_org_id which is a required field.
How can I modify better-auth's user creation behavior to add my custom org and Stripe creation logic? Additionally, how can I access this required field in the user passed in the customSession() function?