From WHMCS Documentation
About this Module
We no longer ship this module with WHMCS.
The InternetSecure payment gateway module was available in WHMCS.
Adding the InternetSecure Payment Gateway
To set up the InternetSecure payment gateway in WHMCS:
- Go to Setup > Products/Services > Payment Gateways.
- Choose the All Payment Gateways tab.
- Click InternetSecure.
- Check Show on Order Form to display this payment method in the Client Area during checkout.
- Configure the desired settings.
- Click Save Changes.