Integrate Worldpay
Integration between DAP and Worldpay is IPN (instant payment notification) based and pretty straightforward.
a) Login to your Worldpay account, go to your Production/Test Installation, set the Payment Response URL to point to the DAP script on your site — http://YOURSITE.COM/dap/dap-worldpay.php (replace YOURSITE.COM with the name of your site)
b) Make sure the ‘Description‘ in Worldpay eXactly matches Product Name in DAP.
That’s it.