POS and retail
Point of sale, checkout hardware and retail back office.
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Add a productHardware and lock-in
Some systems only run on their own hardware and payment terminals. That is convenient and it is lock-in, so price the exit before the entry.
Offline behaviour
A till that stops when the connection drops stops the shop. Ask exactly what works offline and how it reconciles afterwards.
Fees
Software fee plus payment processing plus hardware. Processing usually dwarfs the subscription, and bundled rates are rarely the cheapest available.
Back office
Inventory, purchase orders, staff hours and reporting across locations. A cheap till with no back office moves the work rather than removing it.