references/example-site/connections/youtube/webhooks-deep-dive.html

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<title>Webhooks deep-dive: signatures, retries, idempotency — Evolve YouTube</title>
<meta name="description" content="The full webhook story: signature verification across SDKs, the retry schedule, idempotency window sizing, and dead-letter handling.">
<meta name="author" content="Evolve">
<meta property="video:duration" content="17:55">
<meta property="og:type" content="video.other">
<meta property="article:published_time" content="2026-02-26">
<meta name="keywords" content="webhooks, signatures, idempotency, reliability">
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<h1>Webhooks deep-dive: signatures, retries, idempotency</h1>
<p>Channel: <strong>Evolve</strong> · Duration: 17:55 · Published: February 26, 2026 · 24,701 views</p>
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<p>The full webhook story for production-ready integrations. Signature verification across all four SDKs, the retry schedule (1m, 5m, 30m, 2h, 12h, 1d, 3d, 7d), idempotency window sizing, dead-letter handling, and the one mistake that almost everyone makes the first time.</p>
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<h2>Chapters</h2>
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<li>0:00 — What webhooks are for (and what they aren't)</li>
<li>1:45 — Signature verification: HMAC-SHA-256, replay protection</li>
<li>5:30 — The retry schedule and why it ramps the way it does</li>
<li>9:12 — Idempotency: keys, windows, and de-dup at scale</li>
<li>12:48 — Dead-letter handling and account-contact emails</li>
<li>15:20 — The one mistake everyone makes (parsing the message field for branching)</li>
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<h2>Transcript highlights</h2>
<p>"…tune your idempotency window to at least 7 days. Our last retry attempt is at the 7-day mark. If your window is shorter than that, a successful late delivery can collide with a manual retry from your ops team and you end up double-processing…"</p>
<p>"…signature verification isn't optional. Even if you whitelist our IPs, IPs change. The signature is a 30-second per-customer engineering task that catches a real category of attacks…"</p>
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