Courier is an IoT development platform that allows developers to integrate their devices with other services, enabling real-time interactions between the physical and digital worlds. In a recent project, Riley Napier from the engineering team used the Courier Webhook Provider to send notifications to a BlinkStick Square device, demonstrating dynamic destination configuration and accepting POST requests. The notification triggered an event on a client-side Node.js application, which handled the alert using Socket.io and played a sound through the computer's speakers, transitioning the device through colors of the rainbow. This exercise showcased the potential of Courier in IoT development and encouraged viewers to explore more possibilities with their own projects.