Webhook Security: How to Verify Incoming Requests with HMAC Signatures

If you've ever integrated a payment provider, GitHub Actions, or a third-party API that sends you events, you've used webhooks. And if you've ever worried about whether the request actually came from who it claims — or whether someone could forge one — you've run into the webhook security problem. The solution is HMAC verification. Here's how it works and how to implement it. The problem with unauthenticated webhooks Without verification, anyone who discovers your webhook endpoint URL can send r