How to install SSL certificate from GlobalSighn on apache2?

Question

Apache HTTP Server

Actually, subject.
Please help me understand which of the GlobalSighn certificates available after purchase corresponds to the following Apache parameters:
SSLCertificateFile
SSLCertificateKeyFile (let's say it is not on the site now - where can I get it?
SSLCertificateChainFile
UPD. I did this:
openssl pkcs12 -in domain.pfx -clcerts -nokeys -out z_2018.cer
openssl pkcs12 -in domain.pfx -nocerts -nodes -out z_2018.key
in the config like this:

SSLCertificateFile /path/z_2018.cer
SSLCertificateKeyFile /path/z_2018.key
#SSLCertificateChainFile

As a result, after restarting Apache, I see in the browser
It was not possible to confirm that this is the mail.corp.domain.ru server. Its security certificate belongs to *.domain.ru. Perhaps the server is configured incorrectly, or someone is trying to intercept your data.
What am I doing wrong?

Answer 1

Installing an SSL Certificate on Apache

Answer 2

after purchasing GlobalSighn certificates

What do you have after purchase? You need to start with this, and not with listing the Apache options, half of which you do not need.