Help with autoinstall script upon account creation

I want to have an ecommerce script installed when a client signs up for package 1
If they sign up for package 2 then wordpress is installed automatically
I have this working on my Directadmin servers, I want it to work also on my CWP servers.
I have asked CWP for help, however, nobody there understands what I need, I believe it is very simple, as it was for Directadmin and Cpanel servers.
I am using WHMCS, CWP or DA, and softaculous (and installatron on some servers)
Any assistance either how I can get this done using CWP or how to explain to the CWP staff what I need (I have tried many times, it seems like none of them are webhosts)
Thanks

Perhaps a pseudo picture?

WHCMS --> Hosting package 1 --> CWP API --> create hosting package 1
                                                |__> Softaculous API --> install application 1 (example. OpenCart)

WHCMS --> Hosting package 2 --> CWP API --> create hosting package 2
                                                |__> Softaculous API --> install application 2 (example. Wordpress)