You are tasked with implementing the Delivery Service for an e-commerce platform. This service is responsible for handling all aspects related to shipping customer orders, such as scheduling, updating, tracking, and managing delivery status.
This service will be a standalone microservice communicating with other services (like Order, User, and Inventory) via HTTP APIs or message queues (mocked/stubbed in this exercise). You will use FastAPI for building the microservice and JWT to secure endpoints that require user authentication.