Robust Payment Management SaaS

# Multi-Tenant Payment Order Management System

## Project Description

A SaaS web application for managing payment orders, designed for multiple organizations, is required. The system should allow companies to efficiently manage their payment processes with different access levels based on user roles.

## Technology Stack

### Frontend
- **Next.js 15** with App Router
- **React 19** with TypeScript
- **Tailwind CSS v4** for styles
- **FramerMotion** for animations
- **Radix UI** for accessible components

### Backend
- **Next.js API Routes**
- **Prisma ORM** with PostgreSQL
- **NextAuth.js** for authentication
- **bcrypt** for password encryption

### Infrastructure
- **Docker** for local development
- **Cloud hosting** for production
- **PostgreSQL** as the primary database
- **Redis** for session caching
- Email system

## Required Features

### 1. Multi-Tenant System
- Each organization must have its own sandbox
- Access via subdomains or routes (/org/[slug])
- Independent user management per organization

### 2. User and Role Management
- **4 types of roles:**
- Super Admin: Full system control
- Admin: Full organization control
- Manager: Create and manage orders
- Treasurer: Process payments and approve orders

### 3. Payment Order Management
- Create orders with multiple items
- Statuses: Pending, Approved, Paid, Rejected, Cancelled
- Priority system
- Attachments and documentation

### 4. Payment Processing
- Record partial or full payments
- Multiple payment methods
- Transaction history
- Attached receipts

### 5. Global Administration Panel (Super Admin)
- Consolidated view of all organizations
- Global user management
- System reports and statistics
- Activity logs

### 6. Notifications
- System Notifications
- Unread notification counter
- Notification history

### 7. User Interface
- Modern design with gradients and animations
- Fully responsive (mobile-first)
- Light/dark mode
- Reusable components

## Architecture

- **MVC pattern** with clear separation of responsibilities
- **RESTful API** for all operations
- **JWT-based authentication**
- **Relational database** with referential integrity
- **Granular permission system** by role
- **Audit logs** for all critical actions

## Additional Features to be Developed

### 1. Advanced Reporting System
- PDF/Excel report generation
- Customizable reports by organization
- Dashboard with interactive charts
- Automatic report scheduling

### 2. Integrations
- Documented public API
- Webhooks for important events
- Integration with accounting systems (SAP, QuickBooks, etc.)
- Payment gateway integration

### 3. Security Enhancements
- Two-factor authentication (2FA)
- More detailed audit logs
- Encryption of sensitive data
- Rate limiting and attack protection

### 4. Additional Features
- Approval system with configurable workflows
- Recurring order templates
- Vendor module
- Internal chat/messaging
- Budget and limit system

### 5. Optimizations
- Implement efficient caching system
- Database query optimization
- Lazy loading of components
- Image and file compression

## Developer Requirements

### Required Skills
- **Solid experience** with Next.js 14+ and React
- **Proficiency** in TypeScript
- **Knowledge** of Prisma ORM and PostgreSQL
- **Experience** with authentication and authorization
- **Familiarity** with Docker and cloud deployment
- **Web security best practices**

### Nice to Have
- Experience with multi-tenant systems
- Knowledge of cloud platforms (AWS, Railway, Vercel)
- Experience with payment gateway integration
- Familiarity with testing (Jest, Cypress)

## Expected Deliverables

1. **Complete and documented** source code
2. **Unit tests** for new features
3. **Technical documentation** for implementations
4. **Updated deployment manual**
5. **Basic training** on new features