🚀 MeterFlow – API Usage & Billing SaaS

A complete API management and billing SaaS platform built using PHP & MySQL. MeterFlow allows users to create APIs, generate keys, track usage, and manage billing with a clean dashboard.

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🌟 Features

🔐 Authentication

User Registration & Login Session-based authentication

📊 Dashboard

Total APIs, Keys, Requests Billing summary Usage analytics graph Clean SaaS UI

🔑 API Management

Create API Generate API Key Manage & revoke keys

🔄 API Gateway

Secure API access using API keys Endpoint forwarding Request validation

📜 Usage Logs

Track all API requests Status code monitoring Timestamp logs

💰 Billing System

Free usage limit Pay-per-request model Automatic bill calculation

💳 Payment System (Demo)

Checkout popup flow Payment method selection (UPI, Card, Net Banking) Payment success simulation

📦 Subscription Plans

Free Plan Pro Plan (usage-based) Enterprise Plan (custom)

🛠 Admin Panel

View total users, APIs, keys Revenue tracking System analytics

🧱 Tech Stack

Frontend: HTML, CSS (custom SaaS UI) Backend: PHP (Core PHP) Database: MySQL Server: XAMPP / Localhost

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📁 Project Structure

meterflow/
│
├── auth/
│ ├── login.php
│ ├── register.php
│ └── logout.php
│
├── dashboard/
│ └── index.php
│
├── api/
│ ├── create_api.php
│ ├── generate_key.php
│ ├── manage_keys.php
│ ├── gateway.php
│ └── test_api.php
│
├── logs/
│ └── usage_logs.php
│
├── billing/
│ ├── calculate.php
│ └── plans.php
│
├── admin/
│ └── index.php
│
├── config/
│ └── db.php
│
└── database.sql

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⚙️ Installation

1️⃣ Clone the repository

git clone https://github.com/your-username/meterflow.git

2️⃣ Move to XAMPP

Place folder inside: htdocs/

3️⃣ Import Database

Open phpMyAdmin

Create database: meterflow

Import database.sql

4️⃣ Configure Database Edit:

config/db.php $conn = mysqli_connect("localhost", "root", "", "meterflow");

5️⃣ Run Project

Open:

http://localhost/meterflow

🔌 API Gateway Usage

Example request:

http://localhost/meterflow/api/gateway.php?key=YOUR_API_KEY&endpoint=users

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💰 Billing Logic

Free Limit: Configurable (default: 1000 or custom)

Price: ₹0.5 per extra request

Formula:

extra_requests = total_requests - free_limit

amount = extra_requests * price_per_request

🎯 Future Improvements

Real payment integration (Razorpay / Stripe) Invoice generation Email notifications Rate limiting API analytics charts (advanced) Multi-tenant SaaS support

📸 Screenshots

Register Page

Login Page

Dashboard Page

Create-API Page

Generate-API Page

Manage-API Key Page

Test API Page

Usage_Log Page

Billing Page

Admin Panel

👨‍💻 Author

Kesar Karale

📌 Note

This project is built for learning & demonstration purposes and simulates SaaS billing and payment flow.