Configuration: Connecting to QuickBooks
After the module is installed, log in to your Magento 2 administrative panel and connect it to your QuickBooks account.
IMPORTANT
Before you start you must create a QuickBooks app.
Step-by-step guide
First, you must connect your Magento store to QuickBooks Online. In order to do that, navigate to Store > Configuration > TNW QuickBooks > General and fill the form with proper data
If you are connecting to a QuickBooks Sandbox
Select "Sandbox" from the Environment drop-down and "Save Config"
Click "Connect".
Follow the flow to authorize and connect to your QuickBooks Online Account
Upon successful authorization, you will be redirected back and should see that "Test Connection" button should now be active
Click on "Test Connection" to make sure connection is established