When customer becomes a client in whmcs, I want WordPress user to be created

All the triggers in Bit Integrations are WordPress based. It won’t work for your use case.

We have plan for advance automation plugin. It can be done through that plugin. The plugin has not been released yet. Also, the new plugin's price and subscription is not related to Bit Integrations. It will be completely different product and deal.

That's fine what's the product called

New plugin will be named as "Bit Pi". We don't have any release date yet, hopefully this year.