Set Up Future Payments with Stripe, Expo and Firebase

Question

I'm a beginner in JavaScript and I'm building an Expo app with Firebase for Authentication and Database, I'm trying to add the ability for the user to add their card for future payments, and I can't seem to find any documentation for my situation, I've tried using express.js but I get an error: Network request failed, is there any good documentation I can follow or some type of tutorials, or any other way to proceed.

Thanks