Pfx to base64 encoding

I want to integrate third-party API in my code. I have details of that API.
I want to pass one key with data.
I have a pfx certificate (bought from the website) I want to convert it into base64 encoding with pkcs7 format.
I looked much help in web, not anything useful.

The openssl command can convert between certificate formats. I found a page here that shows commands for the conversions. It looks like you’ll need to first convert the PFX to PEM and then PEM to P7B/PKCS#7.

Hi we can convert to pem file from pfx.

but to convert pem to P7B/PKCS#7 command is asking cer file also.
we don’t have such information.

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