Webhook is failing to responde to Stripe.

[Kainkainkain]

Bug report

Describe the bug

Deployed this using the vercel button.
Set up secrets and keys and webhooks
Payments are working, all is good.
Got an email from Stripe - saying the webhook is failing.
Check on Stripe dashbaord and sure enough - every one:
Stripe Dashboard says "HTTP status code 308 (Permanent Redirect)"
Redirecting to /api/webhooks (308)

To Reproduce

Install via vercel button
Register stripe webhook,
Add secrets to vercel env vars

Try it out as a customer.

Expected behaviour

No errors.