This mini plugin for CAOS integrates Google Optimize into CAOS for WordPress. Click the link to read more.
Click the big green button on this page to clone or download the contents of this repository to /path/to/wordpress-install-root/wp-content/plugins/
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Activate the plugin from within your WordPress Administrator-area in Plugins > Installed Plugins.
On line 23 of caos-google-optimize.php
you can configure your Google Optimize ID.