How to Build a Stripe Customer Portal in Next.js SaaS

When building a B2B SaaS application, one feature that often gets overlooked is the customer portal. It's tough when a lot of the complexity is hidden — Stripe handles the billing, but your users still need a place to manage their subscriptions, update payment methods, view invoices, and cancel or upgrade their plans. That's where the Stripe Customer Portal comes in. In this guide, we'll walk through how to integrate it into a Next.js SaaS application step by step. What is the Stripe Customer Po