Internet Billing System - Key Features

User Authentication

• Secure login system with session management
• Password hashing using PHP's password_hash

Client Management

• Add, edit, or delete client records
• Fields: Name, Address, Plan, Due Date, Status
• Search and filter clients easily

Billing and Payments

• Track and manage monthly payments
• Maintain payment history with date and amount
• Auto-update due status after payment

Due Date Monitoring

• Displays count of due clients per month
• Highlight overdue accounts
• Filter by due date for follow-ups

Invoices and Receipts

• Printable invoices per client
• Shows client details, plan, due date, and last payment
• Clean printer-friendly layout

Dashboard Overview

• Statistics: Total Clients, Active, Due Accounts, Total Paid
• Clickable summaries with modal details

Plan & Service Customization

• Add/manage internet plans (speed, cost)
• Assign plans per client

Web-Based Interface

• PHP/MySQL backend with HTML/CSS/JS frontend
• Accessible from any browser
• Responsive design for desktop and mobile

Admin Utilities

• Export client and payment data (CSV/Excel)
• Database backup and restore
• Clean, modular codebase for maintainability