HTTP - CRT, KEY and HOST

I’m doing an HTTP integration with a financial institution.

Using Postman I managed to make POST work.

There in postman I have to insert a CRT certificate and the KEY. And I am also obliged to put the HOST.

In make, I didn’t find where to put the HSOT. I’m not referring to the POST URL (endpoint) but to the HOST that the CRT and KEY have.

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I have the same/similar issue, but i need to authenticate API call with:
CRT file
KEY file
PFX file

did you find the solution?