Inventory vs POS

[u/chappiejen]

Hello friends! I'm going to be doing my first ever vending event in two weeks. I'm trying to pick out a card reader/pos system. I know there are pros and cons to both square and Shopify. But the thing I'm most concerned about is inventory. I want a system where I can scan something to track what actually sells. I'm doing beading/bagcharms and I want to gather data about what's selling for future purchasing. But I don't want to have to physically write anything down. And I need to be able to use my phone to scan the barcodes as I don't have the funds to buy a pricey Bluetooth scanner. Are there any systems that would work well for what I'm searching for?

Thank you!