The Merchant Warrior payment gateway module is available in WHMCS.
Moneris is a Canadian payment gateway.
The NaviGate payment gateway module is available in WHMCS.
The NETbilling payment gateway module is available in WHMCS.
The Netregistry Pay payment gateway module is available in WHMCS.
Use Offline Credit Card with your own processor for offline payments.
The Optimal Payments payment gateway module is available in WHMCS.