XML Digital Signature

My question:
Hi community,

I hope you can help me. I have the following situation. I try to call a XML interface from a customer. To make a proper call I have to use a private certificate and server certificate. Additionally I have to sign the xml request (xmldsign) before I send it to the customer.

Do you have any advice how to do it best with postman? Is there a built in functionality which I miss? Or is there an option to do it via the pre-requist script and js code?

Or is there no option to sign the xml request in postman?

Looking forward to your help.

Many thanks in advance already.

BR
Alex

PS: Sorry if I’m violating the rules how to describe my problem best. If I missed something please let me know.