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.
Ability to specify redirectURL in the config screen
Improved logging, tested against WHMCS 7.4.2
This module provides support for the Stripe payment gateway for use with WHMCS.
Transfer the paypal fees to your customer
Easily accept Bitcoin, Litecoin, Ether and many other altcoins on your WHMCS website
Accept Bitcoin payments on your website
Integrate easy and secure payments platform Payu Biz way in a few steps.