Point Of Sale (POS) software must work on IOS, Windows and Android devices

General information for the business: POS Kind of development: New program from scratch Description of every module: I am looking for a new software program...it needs to have the following; It must have the following features see examples of these companies 1. https://www.clover.com/your-business/retail#overview 2. https://www.shopify.co.uk/pos 3. https://www.vendhq.com/en/ipad-pos 4. https://www.shopkeep.com/#step-1 Description of requirements/functionality: I only require the software Must do the following 1. be able to add photos for each product 2. have a option for discount 3. customisation receipt 4. bar code scanning 5. 7-8 staff login with each having a number pass-code 6. be able to add more terminals 7. be able to add Bluetooth cash drawer and Bluetooth card reader Extra notes: