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Webhook guides & best practices

Technical content about webhooks: fundamentals, security, testing and integrations. No fluff.

Fundamentals · July 25, 2026 · 9 min read

What is a webhook and how does it work: the definitive guide

Understand what webhooks are, how they work in practice, how they differ from APIs and polling, with real examples of payloads, headers and use cases.

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Security · July 25, 2026 · 11 min read

Webhook security: HMAC signatures, replay attacks and best practices

Your webhook endpoint is an open door on the internet. Learn how to verify HMAC signatures, block replay attacks and apply the practices providers like Stripe and GitHub rely on.

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Tooling · July 25, 2026 · 10 min read

How to test webhooks on localhost: tunnels, inspection and tooling

Providers can't deliver webhooks to your localhost. Compare tunnels (ngrok, cloudflared), inspection endpoints, forwarding and provider CLIs — and learn when to use each.

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Best practices · July 25, 2026 · 12 min read

The 10 most common webhook implementation mistakes (and how to avoid them)

Timeouts from processing before responding, missing idempotency, relying on event order, ignoring retries: the mistakes that break webhook integrations and how to fix each one.

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Integrations · July 25, 2026 · 12 min read

Mercado Pago and Pix webhooks: the complete integration and testing guide

How to set up Mercado Pago webhooks for Pix and cards: x-signature verification, notification flow, the panel simulator, test accounts and the most common integration errors.

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Fundamentals · July 25, 2026 · 10 min read

Anatomy of a webhook request: headers, payload and response

Dissect a real webhook delivery: method, signature and identification headers, event envelope, content types, raw body and what your response must (and must not) contain.

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