Set QuickBooks Preferences to Allow Access
Overview | Customize Exchanges | FAQs
Access preferences must be set in your QuickBooks Desktop financial software to allow Point of Sale to send/receive information from your financial company file. Typically, this access is granted when you run the connection wizard.
However, this option may vary slightly between versions of QuickBooks and you may have to set this preference manually as described below.
To make sure QuickBooks Desktop allows access to Point of Sale:
From the Edit menu in your QuickBooks financial software, select Preferences and then select Integrated Applications.
Select the Company Preferences tab and make sure the following check box is NOT selected:
"Dont allow any applications to access this company file"
Select OK to save your changes.

Allowing Access even when QuickBooks Desktop financial software is not Running
While QuickBooks Desktop must be running and your company file open to initially establish the connection, you can set your QuickBooks Desktop preferences to allow Point of Sale to log in automatically, even when QuickBooks Desktop is not running, for future exchanges.
Note: This setting is only available after the initial connection is made. This setting is not applicable if you are using the remote data sharing connection option.
Go to your Integrated Applications preferences in QuickBooks Desktop, as described above.
Select the application Point of Sale and then select properties.
Make sure the option checkboxes on the Access Rights tab are set as follows:
Selected:
"Allow this application to access this company file"
"Allow this application to log in automatically"
Not selected:
"Prompt before allowing access"
Select or create a user that Point of Sale will use to log in. We recommend that you select "Admin" as the user, but you can create a new one if desired. The specified user must have rights to access all data areas of the company file.
For example, if you create a user named "QB POS" and select this as your login choice, Point of Sale will log in with this identity (and corresponding access settings). Make sure the "QBPOS" user has full access rights.
Select OK to save these settings in QuickBooks.