E-commerce Web Application Development

I need a web-based invoicing and accounting system for my business.

Main features I need:

Customer management (name, phone, address)

Sales invoices (cash, credit, installment)

Installment payment tracking (with alerts)

Product inventory with multiple units and prices (retail, wholesale, etc.)

Profit calculation and sales reports

Daily, monthly, and yearly summaries

Return invoices and edit history

Arabic language support (UI and reports)

Login system (admin and user)


Prefer simple, clean UI.
I will need the full source code when the project is done.