In May 2022, Meta opened the WhatsApp Business API to the public, providing a new avenue for businesses to leverage WhatsApp chatbots to enhance customer engagement and streamline operations. This comprehensive tutorial guides users through the process of building a WhatsApp chatbot for a small ecommerce shop using the WhatsApp Cloud API and Node.js. The tutorial covers configuring the Meta Developer dashboard, setting up webhooks to receive messages, writing business logic for an ecommerce data source, managing customer sessions, and implementing various chatbot functionalities such as adding items to a cart, generating invoices, and checking out. Readers are walked through the technical setup, including server configuration with Express, data fetching from the FakeStoreAPI, and using JavaScript and Node.js to create a seamless shopping experience. As an interactive learning experience, the tutorial provides insights into integrating WhatsApp's features into a business strategy, emphasizing the importance of meeting customers where they are most active. The article concludes by encouraging further exploration of the WhatsApp Cloud API as a valuable tool for businesses to remain competitive and enhance customer satisfaction.