WHMCS Email Templates
OK ... here are the facts.
Plesk is getting better with great features.
WHMCS is probably the billing system that most use since it is affordable and easy to work with.
Ergo ... Plesk need to provide email templates on WHMCS that we can use.
Not sure why you have until, unable to work with WHMCS team to create a comprehensive email templates like cPanel's.
You understand the flow; Team WHMCS understands its billing system.
These are simple things you can do to remove this idea that Plesk is difficult to use which we hear from developers and businesses here.
This ... is something you must make a priority.
Kingsley Felix commented
this is support as WHMCS does not work well with plesk it was built for cpanel
I believe that by default, Plesk ought to have these sent from a billing system to the customer:
1. Hosting Account Welcome Email: New Hosting Account Information, Login Details, Server Information, Email Settings, etc.
2. Reseller Account Welcome Email
When I contacted the WHMCS team on this, they said that they will "recommend creating a duplicate template and adjusting the ports to the ones in use by your Plesk server, as well as customizing the content."
If I'm missing something here, please let me know.