Thanks for visiting our forum today regarding your POS concern, @wyobookkeeper
To sync your client's POS data into QuickBooks, you will need to enable Financial Exchange. This method will help track and post transactions correction on both programs. Please note that the accounts affected by the exchange are pre-set, so you don't need to configure them.
Follow the steps below in QuickBooks Point of Sale:
Once done, set up the connection in POS:
You will be prompted to start QuickBooks and log in as Admin. Click Next.
For more information about Financial Exchange, like the process, accounts affected and how it works, see this link here: Financial Exchange Overview
If you have any questions about this or need help with other topics in POS or QuickBooks, let me know in the comment below. I'll be right here to help you. Have a good one!