Point of sale; POS web based

I am looking to build a website of Point of Sale System combination with Accountant Module. And I would like to enhance the software from time to time. My requirement like most of POS Systems:- 1. Admin pages: a. Secure cannot copy the system and DB. b. Authorization for each user c. Add, edit and delete Users information d. Several reports and enable to export to MS excel sheet 2. Manage Sales: a. Sales (cash, gift, credit card, debit card or others) support Bar code and b. Return sales. c. Quotation. 3. Mange Purchase: a. Purchasing and support Bar code b. Return purchase. c. Also, page for adjust the items e.g. Wastage, Theft and Damage 4. Mange Store a. Mange the branches and Main store. b. Card to Define Categories, c. and Card to Define Items name, d. and sub item name e.g. one cola 1$ and Dozen cola 30$ e. Transfer the items from main store to other branches. f. Inventory for each item or all items g. Item movements h. Reports: Daily, weekly, monthly sale. Or between two dates. (cash, credit card, debit, gift, other) for specific item or all items i. Top products sold j. Profit. 5. Manage the Customers: a. Add, edit and delete Customers information also there is Max credit for each customer b. Add, edit and delete their payments, c. Also report for ageing analyze for the credit. d. Several reports and enable to export to MS excel sheet 6. Manage the Vendors: a. Add, edit and delete Vendors information. b. Add, edit and delete their payments, c. Also report for ageing analyze for the credit. 7. Several reports and enable to export to MS excel sheet 8. Dashboard: charts and today summary: contains today day and date, sales statistic (no of invoices for today, quantity sold, total amount) 9. All Report: Support export page to the MS Excel 10. The system should be easy to use it and nice template. 11. In the future I would like to add also Accountant Module. For more detail please message me with any interest and/or questions.