The QuickBooks(Intuit) Payment Gateway for WHMCS allows you to accept credit card payments on your site through QuickBooks(Intuit) Merchant Account..
The best place to start if you need help with a specific product is to contact the developer. All WHMCS Marketplace developers have both a website and support URL listed.
This module provides support for the Stripe payment gateway for use with WHMCS.
Transfer the paypal fees to your customer
Accept Bitcoin payments and Altcoins on your WHMCS website checkout with CoinGate.com. Receive payouts in Euros, U.S. Dollars or bitcoins.
Integrate easy and secure payments platform Payu Biz way in a few steps.
Paymentwall module for WHMCS.