Hello Christopher,
What exact feature you are looking for?
It is possible to administer PAM users using REST.
However, a single instance of CA PAM basically is not multi tenant featured.
(It is possible to integrate several Directory trees via LDAP - but finally all users end up in a flat user list in CA PAM.)
In such scenarios, I guess best it would be to have a dedicated instance of PAM for each tenant and administer all using the PAM Management Console.
Regards,
Andreas