WHMCS Billing Modules for Streamcreed, XtreamUI and XUI
WHMCS Billing Module for XUI
https://xtreamresell.com/wiki/index.php/WHMCS_Billing_Module_for_XUI
ProjectX for XtreamUI
https://xtreamresell.com/wiki/index.php/ProjectX_for_XtreamUI
WHMCS Billing Modules for Streamcreed, XtreamUI and XUI
https://xtreamresell.com/wiki/index.php/WHMCS_Billing_Module_for_XUI
https://xtreamresell.com/wiki/index.php/ProjectX_for_XtreamUI