The Pay Junction payment gateway module is available in WHMCS.
The Payflow Pro (PayPal) payment gateway module is available in WHMCS.
This module adds unbranded PayPal® Advanced Checkout options for credit and debit cards to the PayPal Payments module.
The PayPal Website Payments Pro payment gateway module is available in WHMCS.
Planet Authorize is a credit card merchant gateway that is integrated with WHMCS.
The PSIGate payment gateway module is available in WHMCS.
Quantum Gateway supports 3D Secure for Visa® and MasterCard® transactions.