Implement a REST API that uses proper resource based URLs, pagination and status codes. In addition you will need to implement some sort of system for creating users and for authorization. You will deploy your application on Google Cloud Platform.

Technical Details:

• Datastore is used to store the relevant data
• Language/Packages: Python 3 and Flask
• Google App Engine to deploy the project

Application Requirements

1. An entity to model the user.
2. At least two other non-user entities.
3. The two non-user entities need to be related to each other.
4. The user needs to be related to at least one of the non-user entities.
5. Resources corresponding to the non-user entity related to the user must be protected.