As long as you're online you can record it all. It works great. For inventory I create bar codes of each item and then add the bar code to the inventory piece. At sale time I just scan the bar code with tablet camera and it adds the time to the ticket. I don't know about offline, but Square has a great inventory management system with their app where it actually deducts the item when sold. At our major weekly event cell phone service was bad for AT&T, Sprint, and another. We had AT&T for our FirstData terminal. At the location the only service that worked reliably was Verrizon so I got a Verizon hotspot so I could use my Samsung tablet. It cost about $50 for the device and $20/month (1GB/month which is quite adequate for sales).
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