SSL_ca_file is for specifying the CA cert file. You want instead to specify your Client cert file and key. Take a look at the SSL_cert_file section of https://metacpan.org/pod/IO::Socket::SSL for some examples and try taking it from there.

In reply to Re: How to convert curl authentication method to perl (client certificate) by hippo
in thread How to convert curl authentication method to perl by newperldeveloper

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