Core Insights - The article explains the concept of Webhook in simple terms, comparing it to a "doorbell" for systems to notify each other in real-time, eliminating the need for constant polling [2][10][12]. Group 1: Understanding Webhook - Webhook is described as a "reverse" API that allows systems to send notifications to each other without the need for constant inquiries [10][12]. - The traditional API method requires users to actively check for updates, which is inefficient and resource-consuming [6][7]. - Webhook simplifies this process by allowing systems to push notifications when specific events occur, such as payment confirmations [12][14]. Group 2: Installation and Functionality - Setting up a Webhook involves three main steps: providing a Callback URL, specifying the events to subscribe to, and handling incoming notifications [17][20][23]. - The Callback URL acts as the "address" where notifications will be sent, and it must be configured in the system that will send the notifications [18][19]. - The system sends an HTTP POST request containing a Payload with relevant information when an event occurs [24][26]. Group 3: Common Pitfalls - Security is a major concern, as the Webhook URL is publicly accessible, making it vulnerable to unauthorized requests [29][30]. - Implementing signature verification is crucial to ensure that notifications are legitimate and from trusted sources [33][35]. - Handling duplicate notifications is necessary to prevent processing the same event multiple times, which can lead to errors [39][40]. Group 4: Practical Implementation - The article provides a step-by-step guide for setting up a Webhook receiver using Python and Flask, including code examples [26][50][56]. - It emphasizes the importance of using tools like Ngrok to expose local servers to the internet for testing purposes [62][63]. - Postman is recommended for sending test requests to verify the Webhook functionality [70][73]. Group 5: Automation with n8n - The article concludes by demonstrating how to integrate Webhook functionality into n8n for automated workflows, allowing for seamless communication between systems [75][88]. - It highlights the shift from a "pull" model to a "push" model in system interactions, enhancing efficiency and responsiveness [85].