I need assistance installing a wildcard ssl certificate on Moodle 3.2.4 

PHP Version 5.6.38-0+deb8u1

Which directory does the certificate need to be installed and which configuration file needs to be modified with the virtual host 443?

My /etc/apache2 directories contain directories: sites-available and sites-enabled.  The sites-enabled directories contain two files:

adminer.conf which is linked to  /etc/apache2/sites-available/adminer.conf

moodle.conf which is linked to  /etc/apache2/sites-available/moodle.conf

My /etc/apache2/sites-available directory contain directories: 000-default.conf, default-ssl.conf, and moodle.conf

The ssl certificate is needed for a TopHat integration plugin.  Can someone please advise?