"Added: WHMCS integration" - Domain Mapping 4.2

Hi,
could the new "Added: WHMCS integration" for Domain Mapping 4.2 be explained ?
There does not seem to be any mention here :
https://premium.wpmudev.org/project/domain-mapping/#detail
or
https://premium.wpmudev.org/project/domain-mapping/#usage

Integrated in what way ? How is this set up ?
Are you perhaps referring to integration in some way with either "WHMCS WP Integration" or "WHMCS MU Provisioning" ?

What type of workflow would this "WHMCS integration" have with Pro Sites ?

any kind assistance in this would be greatly appreciated.

kind regards,

RC.