Ask HN: How do you implement and manage subscription plans in your SaaS app?

I'm looking for suggestions about how to create user facing plans and manage which features are available to them? To my knowledge Chargebee, Recurly, Stripe handle all the billing / subscription management, but do I have to build all the logic around what features are available for which plans in my app, or is there a way to abstract this?

For reference, we currently use Stripe for billing, Firebase for authentication, Node.js on the backend, and React on the front end.