Hi,
For anyone interested, I got this basic config working in ssl-params.conf although it can be in your apache2.conf / .htaccess / VirtualHost config file. If you are running sensitive or production level sites, it is best you consult with your Web Administrator before adding these directives as it is not meant to be foolproof.
support.example.in is my specific sub-domain where osTicket is installed.
Header set Content-Security-Policy "default-src 'self' 'unsafe-inline' support.example.in fonts.googleapis.com fonts.static.com www.google-analytics.com;"
All buttons and functions are working normally for now.
Thanks,
Arao