This tutorial demonstrates how to create a reusable webhook notification system in PHP using Lumen and Twilio for sending SMS notifications. The system allows developers to be alerted via SMS when different events occur on third-party services integrated with their application, as long as they provide webhooks. The system consists of two main components: the API endpoint that receives incoming webhooks and triggers an SMS notification, and the controller that handles creating and dispatching webhook notifications. To test the endpoints, developers can use Ngrok to create a public-facing URL for the application and then use Postman to send requests to the API endpoints. The system is designed to be flexible and reusable, allowing developers to easily integrate it with their own applications.