Connect an API with a .PFX certificate

Hi ! My goal is to connect to an external API. I'm on Retool cloud.
The API provider sent us a .PFX file with certificates. The idea is you run that file to install certificates on your machine and then you are able to connect their API. I'm looking for a way to connect it from Retool cloud.

I unpacked that .PFX on my local machine (Windows) and now there 2 ("CA" and "client") certificates installed.

Windows allows you to export them as :
-1) .CER files (DER encoding), 2).CER files (Base-64 encoding), 3).P7B file

-If I choose "use self-signed certificates" in Retool's resource configuration I should upload 3 files: "CA-certificate", "Client-Key", "Client-certificate", and it says "only PEM, CRT and KEY formats supported".

What do I do then? Is there a way? Thank you in advance!

P.S.
To whom it may concern.
With a help of OPENSSL I was lucky to transform a .pfx to 3 files retool needs.
It works.

Glad to hear it, @AlexanderM! Thanks so much for posting this update, as it may be useful info to others in the future. :+1: