Chrome Extension Licensing System Development

# Chrome Extension Licensing & Subscription Management System

## Project Overview
I need a complete open-source licensing server and admin dashboard for managing multiple Chrome extensions with subscription-based billing and API usage tracking.

**Note:** I'm open to existing deployable solutions that meet these requirements, if available, rather than building from scratch.

## Core Requirements

### 1. Multi-Extension Management System
- Admin dashboard to create and manage multiple Chrome extensions
- Each extension should have independent subscription plans and pricing
- Ability to set different usage limits per extension
- User management across all extensions

### 2. Subscription Management
- Support for multiple billing frequencies:
- Daily subscriptions
- Monthly subscriptions
- Annual subscriptions
- Usage-based billing (API consumption)
- Integration with Stripe for payment processing
- Automatic license activation/deactivation based on payment status
- Webhook handling for real-time subscription updates

### 3. License Validation API
- RESTful API endpoints for Chrome extensions to validate licenses
- Real-time subscription status verification
- JWT-based authentication
- Rate limiting based on subscription plans
- Usage tracking and consumption monitoring

### 4. Usage Tracking & Analytics
- Track API consumption per user per extension
- Monitor usage patterns and limits
- Generate analytics reports
- Example use case: Twitter auto-tweet extension tracking Claude/ChatGPT API calls
- Billing based on actual API consumption

### 5. Admin Dashboard Features
- Web-based admin panel for system management
- Create new Chrome extensions in the system
- Set up subscription plans with custom pricing
- View user subscriptions and payment status
- Monitor API usage statistics
- User management and support tools
- Analytics and reporting dashboard

## Technical Stack Requirements

### Backend
- **Node.js + Express** OR **Python + FastAPI**
- **PostgreSQL** database
- **Stripe SDK** for payment processing (with modular architecture for future payment gateways)
- **JWT** for API authentication
- Webhook handlers for subscription events

### Frontend Dashboard
- **React** for admin dashboard
- **Chart.js** or similar for usage analytics
- **Tailwind CSS** for styling
- Responsive design

### Database Schema
- Extensions table
- Subscription plans table
- Users and subscriptions table
- Usage logs table for API consumption tracking
- Comprehensive relationships between all entities

## Key Features Expected

### 1. Admin Dashboard
- Add/edit Chrome extensions
- Create subscription plans per extension
- View user analytics and usage
- Generate reports
- Manage user accounts

### 2. API System
- License validation endpoints
- Usage tracking endpoints
- Rate limiting middleware
- Webhook receivers
- Comprehensive error handling

### 3. Chrome Extension Integration
- Simple API calls for license validation
- Usage logging mechanism
- Subscription status checking
- Rate limit enforcement

## Project Constraints
- **Must be open-source** (no vendor lock-in)
- **Self-hosted solution** (no recurring SaaS fees)
- **Cost-effective** (only Stripe's ~3% payment processing fees)
- **Scalable architecture** for multiple extensions
- **Future-ready payment system** (modular design to easily add PayPal, Razorpay, etc.)
- **Well-documented** code and API endpoints

## Deliverables
1. Complete source code with documentation
2. Database schema and setup scripts
3. Admin dashboard (fully functional)
4. API documentation with examples
5. Chrome extension integration guide
6. Deployment instructions
7. Stripe webhook configuration guide

## Integration Requirements
The system should provide simple API endpoints that Chrome extensions can call to validate licenses and log usage. The exact implementation approach should be proposed by the developer.

## Budget Range
Please provide your quote based on the complexity outlined above.

## Timeline
Please specify your estimated timeline for complete delivery.

## Skills Required
- Node.js/Express OR Python/FastAPI
- PostgreSQL database design
- React frontend development
- Stripe API integration
- Modular payment gateway architecture design
- RESTful API development
- JWT authentication
- Webhook implementation
- Chrome extension development knowledge (bonus)

## To Apply
Please include:
1. Your proposed technical approach
2. Estimated timeline
3. Portfolio examples of similar projects
4. Questions or clarifications needed
5. Your quote for the complete project