Let me direct you to the right place where you can check for Point of Sale system apps that works well with QuickBooks Online, @ksorel84.
Since we're unable to share and recommend a specific system app, I suggest visiting our Apps store for third-party applications that are most compatible with QuickBooks. From there, you can select a variety of applications that are capable and can work well with QuickBooks Online.
You can refer to this link for available lists of applications: QuickBooks Apps. You can also do this inside your company, simply proceed to the Apps menu on the left panel and then enter a keyword in the search field.
Need help performing any tasks related to your business account and company settings, you can access and browse all articles for QuickBooks products: Community Help Articles. This reference contains most resources with steps on how to update your data and security management, to name a few.
Don't hesitate to hit the Reply button if you have additional questions about integrating POS with QuickBooks Online. As always, I'm only a few clicks away for help. Have a great rest of the day.
