This explains how to set up the connection between SI 2015 and QuickBooks.
SI 2015's QuickBooks integration allows you to create Estimates and Purchase Orders in QuickBooks directly from your SI 2015 Projects. You can also create Items in your QuickBooks database directly from your SI 2015 Catalog of Items.
QuickBooks must be installed on the machine where the SI 2015 Client is installed. Your QuickBooks company file can be stored on any machine on your network, but the actual QuickBooks application must be installed on the machine.
During the "Initial Connection" (see below), you must be logged into QuickBooks as the Admin and you must be in "Single User Mode".
You have now made the connection between SI 2015 and QuickBooks. What happened in QuickBooks can be viewed under Edit->Preferences. When the Preferences form opens, click Integrated Applications and then the Company Preferences tab:
Click the Properties button to see the permissions you just granted, it should look similar to the image below:
If you have not already done so, you will next want to continue with your QuickBooks Settings.