You may have heard or gotten email announcement from Intuit, that starting March 1st, 2016, Intuit will discontinue support for the QuickBooks Desktop REST API.
This change does not affect Teapplix and our QuickBooks Integration products. Teapplix utilizes "QuickBooks Desktop SDK and the QuickBooks Web Connector". This will continue to be supported as per Intuit.
To integrate Teapplix with your Desktop QuickBooks (Windows version, Pro Premier and Enterprise, Point of Sale), install Web Connector from this link.