HMAC-Signed Webhooks: Securing Your Event Stream

Webhooks are powerful—they let external systems react to your events in real time. But there's a catch: how do you know the webhook actually came from you?

Enter HMAC signatures.

The Problem

When your system sends a webhook to a third party's endpoint, anyone who knows that URL can fire requests at it, impersonating your service. They could trigger false transactions, corrupt data, or worse.