Webhook
An HTTP callback — when something happens on a remote system, it sends a POST request to a URL you provide.
In long form.
Webhooks invert the polling pattern: instead of your code asking 'has anything changed?' every minute, the source system pushes events to your endpoint as they happen. Common examples: Stripe webhooks for payment events, GitHub webhooks for commits and PRs, HubSpot webhooks for new contacts. Best practices: validate the webhook signature (HMAC) before trusting the payload, return 200 immediately and process async (most providers retry on non-2xx), and make handlers idempotent (the same event may arrive twice).
We use webhooks heavily for content workflows — a Payload CMS afterChange hook fires a webhook to revalidate Next.js pages, the form submission webhook posts to HubSpot, GitHub webhooks trigger Vercel deploys.
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