You are a backend dev that has been tasked to make a simple rest api that allows you to retrieve, update, and store new content to an inventory. The store you are making the rest api sells only Pens, and is called CZero Pens.

Your Inventory should have the following:

Product name Variant SKU Price Qty Description
CZero Pen Brand Red Pen CZPR 1.00 5 High quality pens that are carbon-neutral
CZero Pen Brand Blue Pen CZPB 1.00 5 High quality pens that are carbon-neutral
CZero Pen Brand Green Pen CZPG 1.00 5 High quality pens that are carbon-neutral
Red’s Pens Black Fountain Pen RPG 5.00 100 Fountain pens designed by Paul Red
Red’s Pens Purple Fountain Pen PRG 5.00 100 Fountain pens designed by Paul Red
Good Quality Pencil BYP .5 1000 Handmade Pencils

You will be making a REST API that should support the following actions:

Technical Spec