CB Subs Worldpay payment plugin issue

We have purchased the CBsubs worldpay payment plugin but couldnt post in the CB subs forum so am posting here.

The problem we are facing is as follow:-

We are using worldpay with recurring payment and the first payment happens just fine and we get the notification also from worldpay but the consecutive recurring payment notifications are not recieved by cb subs and so the account gets de-activated. However if we log into the worldpay, we see that the recurring payments happens just fine.

Can anybody please help out on this.

Just for information, we are still testing in sandbox mode and are using valid dummy credit cards for purchase from here :
www.easy400.net/js2/regexp/ccnums.html

Any help would really be appreciated.

The payment response URL must be properly configured so Worldpay can send the IPNs. Please check within CBSubs > Notifications and see if a IPN was even received for the recurring payment to ensure Worldpay is even sending them.