User Profile API Endpoint

Context

You are building a simple user profile API as a PubNub Function that will be called from a web browser frontend. The API stores and retrieves user profiles from the function's key-value store. The frontend is hosted on a different domain than the PubNub Function endpoint, so browser security restrictions apply.

Task

Write a PubNub On Request function (user-api.js) that implements a RESTful user profile API supporting:

1. Retrieving a user profile by ID
2. Creating or updating a user profile with name and email fields
3. Deleting a user profile
4. Proper error responses for missing users or invalid input
5. Compatibility with browser-based clients on different domains

User IDs are provided via URL path parameters.

Expected Outputs

• A user-api.js file containing a complete PubNub On Request function implementing the user profile API.