Build a Billing software

I need a billing software for my shop with the following things 1) Function so that i an use a barcode scanner to input and sell things 2) Inventory Management 3) Reports like - daily sales, monthly sales, product-wise report 4) Panel to input/ enter/add the inventory and prices into the stock 5) In billing ability to give discount while generating invoice PS:- NO BID CHANGES ALLOWED PLEASE READ B4 U BID.