Worldpay

If you are using Worldpay payment plugin, you will need to make some changes in the settings of your Worldpay account. The steps are:

1. Login to merchant account at worldpay, edit the installation, in the Payment Response URL textbox, enter https:domain.com/index.php?option=com_dms&task=payment_confirm&payment_method=os_worldpay&notify=1, of course https:domain.com needs to be replaced with your site url.
2. Check on Payment Response enabled checkbox