After deploying, Stripe checkout sends customers back to localhost:3000

Solved · 481 views · asked 2 months ago by sophie_l · edited

Payment works on production, but after paying the customer lands on http://localhost:3000/success which obviously doesn't load. First real customer emailed me confused. The code:

const session = await stripe.checkout.sessions.create({
  ...
  success_url: "http://localhost:3000/success?session_id={CHECKOUT_SESSION_ID}",
  cancel_url: "http://localhost:3000/pricing",
});

What I’ve tried

Searched for localhost in the project, found it in 3 places, not sure what to replace it with so it also still works locally.

Comment

Also check your Stripe dashboard for the webhook endpoint URL. If that's localhost too, orders aren't being processed at all. tobiasw 2 months ago · edited

2 answers

Marked as helpful by the asker

tobiasw2 months ago · edited

Put the base URL in an env var with a different value per environment:

# .env.local
NEXT_PUBLIC_SITE_URL=http://localhost:3000
# Vercel, Production
NEXT_PUBLIC_SITE_URL=https://yourapp.com

const base = process.env.NEXT_PUBLIC_SITE_URL;
success_url: `${base}/success?session_id={CHECKOUT_SESSION_ID}`,
cancel_url: `${base}/pricing`,

For preview deployments, leave it unset for Preview and fall back to https://${process.env.VERCEL_URL}. Don't use VERCEL_URL for production: it's the unique deployment URL, not your custom domain.

And don't trust the success page alone to mark an order paid. Fulfil orders from the checkout.session.completed webhook; customers close tabs.

Comment

Fixed and emailed the customer. And yes, I was marking paid on the success page... webhook is next on my list. sophie_l 2 months ago · edited

Good. That one will bite harder than localhost. tobiasw 2 months ago · edited

nils_tw2 months ago · edited

Alternative without an env var, inside a server action or route handler:

import { headers } from "next/headers";
const origin = (await headers()).get("origin");

That's always the URL the user is actually on, including previews. I'd still validate it against a list of known domains.

Comment

Works, and the validation part is important. Don't let a spoofed Origin header decide where Stripe redirects to. tobiasw 2 months ago · edited

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After deploying, Stripe checkout sends customers back to localhost:3000

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After deploying, Stripe checkout sends customers back to localhost:3000

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