How to use client certificate (mTLS) in REST call?

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Hi everyone,

I have a case with WEBCON BPS 2026 and a REST integration.
I need to call an external API that requires a client certificate (PFX / mTLS). Everything works in Postman, but in WEBCON I can’t find how to pass the certificate.

Currently I’m using:
-REST Web Service connection
-Authentication: Anonymous
-HTTPS + JSON
I don’t see any option for:
-client certificate
- selecting from Windows store
-or using a thumbprint

Has anyone faced something similar?
Does WEBCON support mTLS for outbound REST calls at all, or is Custom Authentication / SDK required?

Any guidance or examples would be appreciated.