Modification of SambaPOS V3

We want to do some modification to SambaPOS. Details as below. 1) Change the name of SambaPOS to our company name. 2) When configure item at the back-end, we want to add 1 more check box which is ( whether we want to give stamp to this item or not ). If user ticked the checked box, it means we will give stamp for this item. 3) While printing the receipt, print the QR code as well. However, before printing the receipt, there should be option ( print / not print ) QR code. - When we scan QR code: we want to show below information: 1) store name 2) Date & Time 3) Receipt No. 4) item id and its stamps ( PS : item numbers = numbers of stamps, we will give 1 stamp for 1 item) 5) Total Amount.