How to set up HTTPS with client certificate on ABAP server

I have a client certificate p12 file that we need to use for HTTPs communication with an external server.

In order to load this certificate to a PSE, is the only way to do this through the sapgenpse utility?

I have uploaded the Server SSL Certificate through STRUST and the other certificates in the certificate hierarchy.  Do I also need to upload the client certificate in STRUST?

Any help is appreciated.  Is there a good reference on how to use client digital certificates on the ABAP server to communicate with external systems?

Thanks,

Jay