Hi all,
I'm pleased to announce that the 7.9 public beta is now live, featuring usage-based billing! One of the available metrics on the cPanel module is "Sub-accounts"; effectively the number of accounts created by a reseller. This means that you can invoice a reseller based upon the number of accounts they have created!

Please test it out, and let us know your feedback during the pre-release period.
Beta information: https://beta.whmcs.com

Feature documentation: https://docs.whmcs.com/Usage_Billing
Discussion: https://whmcs.community/forum/485-v79-beta-discussion/