Hi there, DTmb.
Let me direct you to the right place where you can check for Point of Sale system apps that can be integrated with QuickBooks Online.
You can visit out Intuit Marketplace website for third party applications that are most compatible with QuickBooks. From there, you can shoose a variety of applications that are capable of tracking inventory and scale.
You can view the full list of available here: https://apps.intuit.com/.
I'll be around here in the Community, so please don't hesitate to reach out to me if you have any other concerns.
