Building a Replay-Safe Webhook Event Gateway

<p><em>Three API calls. One template ID that has to carry through all of them.</em></p> <p>Resend's API for sending a templated email is three steps:</p> <ol> <li>Create a

<p>I review a lot of webhook handlers. Roughly <strong>3 out of 5 either have a subtle signature-verification bug</strong> — or someone disabled verification entirely "to make it

<p>A customer can complete checkout once while your webhook handler receives the<br /> same event more than once. If every delivery creates access again, one purchase<br /> can

<h1> Mitigating DB Lock Contention and Race Conditions in Asynchronous Webhook Ingestion </h1> <h2> 1. The Production Reality: Why Check-Then-Act Fails Under Load </h2> <p>In

<h1> Building an API Gateway From Scratch in Go </h1> <p>API gateways are one of those infrastructure components that feel intimidating from the outside. You know they handle

<p>Short answer: put each user reminder on a queue, make the consumer idempotent, retry transient delivery failures with backoff, and move exhausted work to a dead-letter queue

<p>A file gets hashed. The hash goes off to get anchored. Sometime later, a webhook arrives saying the anchor is done. That gap between "submitted" and "confirmed" is where most

<p>If you've ever debugged a webhook integration, you've probably used webhook.site. It's free, it's instant, it works.</p> <p>But here's what nobody tells you about free webhook