How does the courier find out about the order and how does the location data get into the system?

The courier learns about a new order through a mobile application that receives notifications from the server via push messages or through WebSocket for instant data delivery. When an order is created, the server sends a notification to the courier's device.

The courier's location is determined using the GPS module of the mobile device. The application periodically sends coordinates to the server via REST API or WebSocket, where the data is processed and displayed in the system for real-time delivery tracking.