Reliable Webhook Processing in NestJS: Signatures, Idempotency, Retries & Queues

<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>Have you ever written something like this?<br /> </p> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>js setInterval(async () =&gt; { const res

<p>Webhooks look simple at first: receive an HTTP request, forward it somewhere, return 200 OK.</p> <p>That simplicity disappears the moment the system becomes

<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

<p>Banking software cannot afford to be casual about anything. Every transaction needs to be verified, logged, protected from tampering, and traceable if something goes wrong.

<h1> Por que entregar um webhook de forma confiável é mais difícil do que parece </h1> <p>Todo mundo que já integrou um gateway de pagamento (Kiwify, Hotmart, Stripe, Asaas)

<p>If you build microservices with NestJS, you already know how powerful and structured the framework is. However, starting a new project often involves a fair amount of initial

<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