nsc

It's a popular payment gateway in Europe, that allows to collect payments, gives low rate transactions to the whole Europe.
It can help collect payments from credit cards, even via banklinks in different countries.
 
It already has ready to use plugins for systems as magento, exid eshop, zencart, whmcs and so on
Most of the plugins are created for eshops, but there is also whmcs in the list:
https://www.paysera.com/banklink_cms_plugins.html
 
They provided development info on how the payments are made:
https://developers.paysera.com/en/payments/current
 
I don't know about the quantity of users that would love to have this, but I thought I add it to feature request. Maybe there will be more people that would be willing to see this payment gateway available.

When user fills up the registration form, DirectAdmin module password part is visible:

When user fills up the registration form, DirectAdmin module password part is visible: