Windows based application for Shop Billing, Inventory and Customer Managment

I am looking for a Windows based application for shop billing, inventory and customer management specifically tailored to a retail shop.The application should have inventory management features that can track items in stock, in addition to customer management that can manage customer accounts and should generate bills and invoices. Application data should be stored online. The application should be used by a team of 2-5 people for a consistent and optimized workflow. I'm looking for an intuitive and efficient application that streamlines business processes and empowers us to run our shop more effectively.