Crypto Market Platform with MPesa Compatibility

P2P Crypto Trading Platform with MPesa Integration
1. System Architecture Overview
High-Level Architecture
+----------------+ +----------------+ +-------------+
| Client Apps |<--->| Backend API |<--->| Databases |
| - Web (React) | | - Laravel | | - PostgreSQL or mysql |
| - Android | | - RESTful | +-------------+
| - iOS | | - WebSocket |
+----------------+ +----------------+
^ ^
| |
v v
+----------------+ +----------------+
| Wallet Services| | Payment System |
| - MetaMask | | - MPesa API |
| - WalletConnect| | - Webhooks |
+----------------+ +----------------+

2. Frontend Implementation
Web Application (React)
Framework: React.js with Redux for state management
Key Components:
User authentication screens
Dashboard with wallet balances
Marketplace for browsing/creating offers
Transaction history
Chat interface for buyer-seller communication
Profile management and settings
Mobile Applications (React Native)
Platform: Cross-platform with React Native
Key Features:
Deep linking for wallet connections
Push notifications for trade updates
Native MPesa STK push integration
Biometric authentication
QR code scanning for quick transactions
UI/UX Design Principles
Mobile-first responsive design
Intuitive navigation with clear CTAs
Consistent branding across platforms
Accessibility compliance
Localization support for Swahili and English
3. Backend Implementation
Laravel API Structure
Authentication System:


JWT for session management
Web3 signature verification for wallet authentication
2FA with SMS/email OTP
Database Models:


Users
Wallets
Offers (Buy/Sell)
Transactions
Payments
Messages
Notifications
Dispute Cases
Key API Endpoints:


/api/auth/* - Authentication services
/api/wallet/* - Wallet management
/api/offers/* - Marketplace listings
/api/transactions/* - Trade execution
/api/payments/* - MPesa integration
/api/messages/* - In-app chat system
/api/notifications/* - User alerts
WebSocket Integration
Real-time updates for:
Chat messages
Trade status changes
Payment confirmations
Market activity
4. Blockchain Integration
Web3 Wallet Connection
Integration with MetaMask, WalletConnect, and other providers
Balance checking without requiring custody
Transaction signing for secure trades
Non-Custodial Architecture
Users maintain control of private keys
Escrow implemented via smart contracts (optional)
Multi-signature approval for added security
5. MPesa Integration
Payment Flow
Buyer Initiates Purchase:


Selects offer to buy
System calculates amount and fees
Trade locked in escrow
MPesa STK Push:


System triggers STK push to buyer's phone
Buyer enters MPesa PIN on phone
Payment processed through Safaricom
Payment Verification:


MPesa webhook notifies system of successful payment
System confirms payment details
Trade status updated to "Payment Received"
Crypto Release:


Seller notified of confirmed payment
Seller approves release (or auto-release after timeout)
Crypto transferred to buyer's wallet
Technical Implementation
Safaricom API Integration:


Daraja API for C2B transactions
STK Push implementation
Webhook endpoints for payment notifications
MPesa Payout Process:


B2C implementation for seller withdrawals
Transaction reconciliation system
Fee calculation and processing