General Concepts
What is Webhook?
Definition
An automated notification sent from a subscription service to your application when specific events occur.
Understanding Webhook
Webhooks are the push-based counterpart to APIs (which are pull-based). When something happens in a subscription service — like a payment processed, subscription canceled, or usage limit reached — a webhook sends a notification to a URL you specify. This enables real-time automation without constant polling.
Common subscription-related webhooks include payment success/failure notifications, plan change alerts, and usage threshold warnings. For managing subscriptions programmatically, webhooks from payment processors like Stripe are essential for keeping your systems in sync.