Sum Calculator API

A secure RESTful API built with Python and Flask that calculates the sequential sum of a list of numbers.

---

Objective

This project fulfills the API Development & Deployment Challenge requirements:

• Secure POST /sum endpoint
• API Key Authentication (X-API-KEY)
• Sequential sum calculation
• Local testing with pytest
• Public GitHub repository ready
• README with setup + request examples

---

Features

• POST /sum endpoint
• API Key authentication
• JSON request validation
• Standardized success/error responses
• Root endpoint (/)
• Health check endpoint (/health)
• Local test suite
• Demo script for validation

---

Project Structure

protocol_round2/
│── venv/
│── .env
│── .gitignore
│── README.md
│── app.py
│── requirements.txt
│── test_api_demo.py
│── test_app.py