hmac

When I need lightweight message integrity without standing up a full asymmetric trust model, HMAC signing is a solid tool. The important details are canonicalization, timestamp freshness, and constant-time comparison. Most failed implementations get t

A webhook endpoint is an internet-facing parser plus an authentication problem. I verify signatures, enforce recent timestamps, and store event IDs to block replay attempts. Reliability matters too, so handlers should be idempotent and fast to acknowl