Get Client Certificate from HTTPS REST Service


Is there a way to receive the client certificate information, used for client authentication during a web service call?

I have a package, with a REST (POST) Service. When I start the request from my Postman using the client certificate I can successfully call the service.
I wanted to know if there is a way to obtain some information about the client certificate or directly the byte array of the certificate in order to use the service.

Thank you in advance,