# What to Check in a Next.js SaaS Boilerplate with Stripe and Auth

> Four non-negotiables that separate a starter you will ship on from one you will abandon — and how to evaluate all of them in ten minutes.

- Author / publisher: make1day (company)
- Published: 2026-03-03
- Updated: 2026-11-07
- Canonical: /blog/nextjs-saas-boilerplate-stripe-auth
- Category: Comparison
- Tags: Next.js SaaS boilerplate with Stripe and auth, Next.js SaaS starter with auth, Stripe Supabase starter
- Language: en

When you search for a Next.js SaaS boilerplate with Stripe and auth, you are really asking one question: how little of the commodity 60% do I have to write myself?

## The four non-negotiables

1. Auth — email magic-link and OAuth through a managed provider, with row-level security on by default.
2. Billing — a hosted checkout plus a webhook that flips a flag in your database. If the webhook is not wired, it is a demo, not a business.
3. Database — Postgres with a seeded schema and RLS policies you can actually read.
4. Deploy — a Vercel-ready config and a one-command path to production.

## The part most templates get wrong

Webhook verification is not a detail. A missing, invalid or malformed signature must be rejected with HTTP 400 — not silently treated as an empty event list. In this codebase every provider adapter throws on verification failure, and an empty array means only one thing: the event was validly signed but needs no handling. Replays are deduplicated by event id before any license or plan is written.

Most free templates skip idempotency; you discover it at your first refund or duplicate event.

## One gateway or six?

The default here is Waffo Pancake (Merchant of Record). Stripe, Creem, PayPal, Lemon Squeezy and Waffo Acquiring are switchable at generation time, with none as a valid choice when you bring your own billing. A single POST /api/webhook route and one PaymentProvider interface sit under all of them, so your app code never branches on gateway.

## Ten-minute evaluation

Clone it, set the env vars, run the dev server, then try to: sign up, hit the paywall, complete a test checkout and see the plan flip. Also fire a webhook with a bad signature — it must return 400, never 200. If any step is blocked by missing code, keep looking.

## FAQ

### Does a starter need Stripe specifically?

No. Stripe is the most documented option, but a Merchant of Record (Waffo Pancake, Lemon Squeezy) handles global tax without a company entity, and some markets need PayPal or Creem. What matters is one provider-agnostic checkout/webhook contract.

### What should a webhook return on a bad signature?

HTTP 400. A 200 with an empty event list lets forged or malformed requests look successful. Verification failure must throw; only a validly signed but unhandled event should be acknowledged as ignored.

### Is OAuth included?

With Supabase Auth, yes — email magic-link plus Google, GitHub, Apple and Microsoft. The local SQLite fallback is an account/role directory, not a full auth provider: no MFA, no OAuth, no session rotation.

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Source: make1day. See /llms.txt and /llms-full.txt for the full machine-readable product description.