The Cryptographic Trust Problem (Why Webhooks Are Unforgiving) Webhooks are the nervous system of modern production apps. Whether you are processing a payment on Stripe, tracking a subscription on Lemon Squeezy, or fulfilling an order via Shopify, webhooks are how external platforms tell your backend: "Hey, something important just happened". Because these webhook endpoints have to be publicly accessible, they are prime targets for malicious actors. To prevent this, platforms use cryp...