Assume you use Stripe — a payment service — for billing and want to automatically email customers when payments fail. Here's an example of how a webhook might work:
1. You charge a customer who subscribes to your service, but the payment is unsuccessful.
2. You've set up a Stripe webhook to send real-time updates on failed payments to a web service you own. As a result, Stripe sends you a failed payment notification via HTTP.
3. You receive the HTTP request, parse it, and send it to the customer via email.
