This is a really interesting use case. If you use Stripe, you can use the Stripe Customer Portal to allow your users to handle subscriptions, update users' information, billing details, etc: https://www.arengu.com/tutorials/passwordless-authentication...

Anyway, there are many boilerplate SaaS blocks that might make sense to explore for Arengu, but currently we're focused on signup and onboarding flows/screens.