Functional requirements of Smart Billing System with non-functional

Functional Requirements

1. User Authentication and Authorization
   • Users must be able to register, log in, and manage their accounts.
   • Different roles (e.g., admin, customer, manager) should have specific permissions.
2. Billing Management
   • Ability to create, view, update, and delete bills.
   • Support for various billing methods (e.g., credit card, bank transfer).
   • Generate detailed invoices and receipts.
3. Product/Service Catalog
   • Manage a list of products or services including prices and descriptions.
   • Support for categories and subcategories.
4. Transaction Processing
   • Calculate total amounts, taxes, and discounts.
   • Process payments and update billing records.
5. Reporting and Analytics
   • Generate reports on sales, revenue, and customer activity.
   • Support for exporting reports in various formats (e.g., PDF, Excel).
6. Customer Management
   • Maintain customer profiles, including contact information and billing history.
   • Track customer payments and outstanding balances.
7. Notifications and Alerts
   • Send notifications for billing updates, payment reminders, and account changes.
   • Support for different communication channels (e.g., email, SMS).
8. Integration with External Systems
   • Integrate with payment gateways for processing transactions.
   • Support for importing/exporting data to/from other systems (e.g., accounting software).
9. Data Backup and Recovery
   • Regular backups of billing data.
   • Recovery procedures for data loss.
10. Audit Trail
    • Maintain logs of all billing-related activities for auditing purposes.

Non-Functional Requirements

1. Performance
   • The system should handle a high volume of transactions and users efficiently.
   • Response times for user actions should be within acceptable limits (e.g., <2 seconds).
2. Scalability
   • The system should be able to scale horizontally or vertically to accommodate growth in users and data.
3. Availability
   • Ensure high availability with minimal downtime (e.g., 99.9% uptime).
   • Implement failover mechanisms to handle system failures.
4. Security
   • Protect sensitive data through encryption and secure access controls.
   • Implement regular security audits and vulnerability assessments.
5. Usability
   • The system should have an intuitive user interface with easy navigation.
   • Provide user support and documentation.
6. Compatibility
   • Ensure compatibility with various devices and operating systems.
   • Support integration with other software or systems as needed.
7. Maintainability
   • The codebase should be modular and well-documented for ease of maintenance.
   • Implement automated testing and continuous integration.
8. Reliability
   • The system should operate reliably under normal conditions and handle errors gracefully.
   • Implement robust error handling and recovery mechanisms.
9. Compliance
   • Adhere to relevant legal and regulatory requirements (e.g., data protection laws, financial regulations).
10. Efficiency
    • Optimize resource usage (e.g., memory, CPU) to ensure efficient operation.