Online Shopping

(source -> https://github.com/simonrenoult/nodejs-application-architecture)

Your task is to write an API for an online shopping site. It may be a web REST API or just a set a functions / classes.

Domain

Product : have an identifier, a name, a price and a weight
Order : have a status (pending, paid, cancelled), a product list, a shipment amount, a total amount and a weight
Bill : have an amount and a creation date

Features

Your API should allow the user to :

list, create, find by id, delete a product
list, create, find by id, delete an order
sort the products by name, price or weight
sort the bills

Business rules

A quick look at the requirements indicated that :

A 5 % discount is applied to the Bill when the price of the Order exceeds 1000€
A Bill indicates the shipment costs : 25 € for every 10 kg (50 € for 20kg, 75 € for 30kg, etc.)
Bills are automatically generated when an Order status is set to paid
A paid Order cannot be deleted
An Order contains at least 1 Product