Client side Billing Software with QR Code

Need A client side billing Software with QR Code using js, jQuery, ajax, php, html and mysql. generate bill on client side with QR code with in 4 sec in this billing page we need subtotal of rows with discount textbox with calculation. and Refund menu in same page and multiple discount in multiple subtotal. refund process in same bill and then final bill create in same bill page . most of important is the all calculation is in client side and process done in just under 4 sec. bill with QR code in which invoice no and bill final amount which further applicable in cash counter. i attach a file of bill which is only for reference 3 inch receipt.