Follow these steps to install and execute it:

1. Clone the repository
2. Change to the directory of the application
3. Create a .env and project.env with the examples in /contrib
4. Build the application
5. Up the application
6. Run the tests stack
7. Test the application sending to it a POST request with a payload

API may stand for Application Programming Interface, but humans have to be able to read the APIs, too; someone has to do the programming. Django REST Framework supports generating human-friendly HTML output for each resource when the HTML format is requested. These pages allow for easy browsing of resources, as well as forms for submitting data to the resources using POST, PUT, and DELETE.

Thus, to test this API just run the application and connect to the endpoint of each level,

That is,

http://127.0.0.1:8000/level1

http://127.0.0.1:8000/level2

http://127.0.0.1:8000/level3