DevOps and Software Engineering for E-commerce Website

I have been asked by the customer account manager at my company to develop an account microservice to keep track of the customers on our e-commerce website. Since it is a microservice, it is expected to have a well-formed REST API that other microservices can call. This service initially needs to create, read, update, delete, and list customers.I have also been told that someone else has started on this task. They have already developed the database model and a Python Flask-based REST API with an endpoint to create a customer account. I just need to plan to add the REST APIs to read, update, delete, and list accounts. Since I will be working in an online lab environment, I will need to plan my work to get that environment ready for development.