Digital Wallet for Mobile Payments: Computer Engineering Guide
1. Introduction
Overview of the project.
Objectives of the system: Facilitate secure and convenient mobile payments, provide a platform for transaction management, and integrate with various payment methods.
Scope of the system: Applicable for peer-to-peer transactions, in-store payments, and online purchases.
2. Requirements Analysis
Functional Requirements:
· - User registration and authentication.
· - Add, remove, and manage payment methods (credit cards, bank accounts, etc.).
· - Execute transactions securely.
· - Provide transaction history and receipts.
Non-Functional Requirements:
· - High availability and fault tolerance.
· - Secure and encrypted transactions.
· - Scalability for a growing user base and transaction volume.
3. System Design
Architecture:
· - Client-server architecture with mobile apps as the client and backend servers handling processing.
· - Integration with third-party payment gateways.
Data Flow Diagrams (DFDs):
· - Level 0: Overview of user interactions with the digital wallet.
· - Level 1: Modules like User Management, Transaction Processing, and Notifications.
Database Design:
· - Tables: User Accounts, Payment Methods, Transaction Logs, Notifications.
4. Technology Stack
Mobile Application Development:
· - Platforms: Android (Java/Kotlin), iOS (Swift/Objective-C), or cross-platform (React Native/Flutter).
Backend Development:
· - Languages: Python (Flask/Django), Node.js, or Java (Spring Boot).
· - Frameworks for APIs and transaction processing.
Database:
· - SQL (PostgreSQL, MySQL) or NoSQL (MongoDB, Firebase).
Payment Gateways:
· - Integration with PayPal, Stripe, or Razorpay.
Security Protocols:
· - TLS/SSL encryption, two-factor authentication, and secure tokenization.
5. Implementation
Frontend Development:
· - Design user-friendly interfaces for mobile platforms.
· - Implement features like QR code scanning and NFC payments.
Backend Development:
· - Develop APIs for authentication, payment processing, and transaction management.
· - Implement real-time notification systems for transaction status.
Integration:
· - Connect with payment gateways and financial institutions.
· - Implement push notification services for user alerts.
6. Security
Encrypt user data and payment details during storage and transmission.
Implement multi-factor authentication (MFA) for account access.
Use secure tokenization for storing payment methods.
Regularly audit and test for vulnerabilities.
7. Testing
Unit Testing: Validate individual components like authentication and payment processing.
Integration Testing: Ensure seamless interaction between frontend, backend, and payment gateways.
System Testing: Test the system under real-world usage scenarios.
Performance Testing: Evaluate transaction speed and app responsiveness.
8. Deployment
Publish the app on app stores (Google Play Store, Apple App Store).
Deploy backend services on cloud platforms (AWS, Azure, or GCP).
Monitor app and backend performance in real-time.
9. Maintenance and Updates
Regularly update the app for compatibility with new OS versions.
Implement feedback-driven improvements and feature enhancements.
Ensure continuous monitoring of security and performance metrics.
10. Appendix
Glossary of terms.
References and additional resources.