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TL;DR: Stripe vs Square in 2026: Fees, Webhooks, Zapier Timeout Fix & Twilio Export Issues — most cases trace to a config mismatch, a hidden assumption, or a step skipped during setup. The fix path below covers the high-percentage causes first. If you're still stuck after 10 minutes, text PJ — most issues answered in one reply. 858-461-8054.

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Operator Problem Guide

Vercel + Stripe Webhook Not Working? The 3 Real Causes (and the One-Line Fix)

I'm PJ — I'm in Encinitas and I help operators ship payment integrations that don't break at 2 AM. The Vercel + Stripe webhook combo fails for 3 specific reasons in 2026: cold-start timeouts, the Next.js body-parser eating the raw payload, and 405s from a bad route handler. Here's how to diagnose + fix each in under 10 minutes.

Quick diagnostic — which one is it?

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Questions Vercel + Stripe operators keep asking

Real Answers

Vercel + Stripe Webhook Body Parser (the #1 cause)

Next.js parses the request body before Stripe's signature check runs — that breaks signature verification 100% of the time. Add export const config = { api: { bodyParser: false } } (Pages Router) or use await req.text() (App Router). Read the raw body before passing to Stripe. One line, done.

Vercel Function Cold Start Timeout

Hobby tier functions timeout at 10s. If your handler does DB writes + Stripe API roundtrips + external calls, you'll hit it on cold starts → Stripe marks the delivery failed and retries. Fix: bump maxDuration in route config (10s Hobby, 60s Pro, 300s Enterprise). For heavy work, respond 200 immediately + queue.

405 Method Not Allowed (App Router gotcha)

Migrated from Pages Router to App Router and seeing 405s? You need export async function POST(request) as a NAMED export — not export default. Routes also live at /app/api/webhook/route.ts, not /pages/api/webhook.ts.

Zapier Webhook Timeout Issue 2026

Zapier times out at 30 seconds. If your Stripe or custom webhook handler takes longer, Zapier marks it failed and retries — creating duplicates. Fix: respond HTTP 200 immediately in your handler, then process the payload in a background job. Works on Vercel, Render, Railway.

Twilio Export Not Working (2026)

Three causes: (1) Export permission not enabled — check Console → Account → General Settings → Data Export. (2) You're over the 10,000 record cap — break into date ranges. (3) You're using a subaccount API key — exports require the main account key. Fix one of those and it will work.

Vercel Stripe Webhook Body Parser Fix

Next.js parses the request body before Stripe's signature check runs — and that breaks verification. Add export const config = { api: { bodyParser: false } } to your webhook route, then read the raw body with getRawBody(). One line, done.

Related reads → stripe webhook not working refund policy explained → Stripe Webhook Not Working? Fix It Fast (2026 Checklist) → stripe webhook not working quick checklist for tutors → stripe webhook not working quick checklist for restaurants

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