Welcome to the code-syntax-highlighter wiki!
If you haven't, you can install & try it out for free from Atlassian Marketplace https://marketplace.atlassian.com/apps/1219685
If you have already used Code Macro, it works in similar way.
Once installed, go to your Confluence page & follow these steps.
{
& click on Open macro browser
Insert
edit
and then preview
on the right side to view highlighted code. If everything is fine, save and publish.If you face any issue, please create an issue or send me email on nkchhantyal [at] gmail.com
Contact support nkchhantyal [at] gmail.com