Write python code to implement authentication of Instagram User

This is a super simple project. No UI, no test and realistically, all code will probably be in a single file.

Requirement:

- Start up Flask app
- Authenticate Instagram User via the official Instagram API by hitting a Flask endpoint
- From Instagram redirect with access token, print it out

I am looking for someone who can do the following:

- Write a simple Flask app
- Implement basic logic to authenticate a user and print out their access token

Not required:

- No UI
- No unit test

On completion:

- Provide a demo of the implementation
- Help set up my own environment so I can run the code.