Stripe Webhook Signature Verification Failing

Your v0-generated Next.js application receives Stripe webhook events but fails to verify their signatures, returning 400 errors or throwing 'Webhook signature verification failed' exceptions. Payments are processed by Stripe but your application never confirms them, leaving orders in a pending state and customers confused.

Stripe signs every webhook event with a signature derived from the raw request body and your webhook signing secret. If the body is modified in any way before verification (such as being parsed as JSON), or if the signing secret is incorrect, verification fails. This is a critical security feature that prevents attackers from sending fake webhook events to your application.

This is one of the most common Stripe integration issues because Next.js API routes automatically parse the request body as JSON, which modifies the raw body that Stripe's verification expects.