The NoChex 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.
The PagSeguro payment gateway module is available in WHMCS.
The Pay Junction payment gateway module is available in WHMCS.
The Payflow Pro (PayPal) payment gateway module is available in WHMCS.
The Payment Express payment gateway module is available in WHMCS.