...

In addition, admin can set information such as: Title, Payment Action, Payment Methods, Sandbox Mode Enabled, PSiGate store key test,  New Order Status. 

Image Modified

 Some attentions that you should know when you set up: 

...

In case, customer wants to refund product. Select orderID and click Refund to repay. 

NOTE:

All of the payment's process operate in Worldpay's payment site, not in Magento.

Update

• When a new update is available, we will provide you with a new package containing our updated extension.
• You will have to delete the module directory and repeat the installing steps above.
• Flush the config cache. Your store and newly installed module should be working as expected.

...