website for selling product

I need a website to track the stock of my products and increase the ease of shopping. First of all, there will be a screen where users will be registered with their e-mail addresses. Following this screen, a QR code will be generated. People working at the cash register will be able to load balances with customers' QR codes through their own admin panels. Their products will have ISBN codes. Employees at the stalls will be able to scan the products and eventually scan the customer's QR code, allowing the products to be deducted from their balance and stock. When leaving at the end of the day, customers will be able to request the remaining balance in cash or credit card. There will be an admin panel where product sales and stock transactions can be downloaded in Excel format.
Employees will be directed to the screens according to their roles.