Ordering and apps
Customers, reps, cashiers, and the warehouse each have a way into the same backend. What they sell or receive updates the one stock location.
Trade customers and retail customers can order in their own time, on a site or an app that is linked to your backend and to the prices that belong to them.
This marketing site is not that shop. Each business gets its own ordering website and, where wanted, its own branded apps.
Reps take orders on an iPad, including in places with no signal. The app keeps a local copy of the data, works offline and online, and syncs on its own when a connection is there.
Cloud tills for the counter, using the same stock and the same customer accounts as the websites.
The Android warehouse system is where goods are counted, picked, and received. It is tied to purchasing as well as to sales.