Excluding Checkout from caching

Hi,
I’m having caching issues with our Checkout and wanted to check if there’s anything specific I need to do to exclude the Checkout within the Cart flyout from the cache? I’m using Siteground Optimizer and WP Rocket. I can exclude using a URL, which of course I can do directly using /checkout/, however I think this might not work for the Checkout in the fly out cart? I can also exclude using cookies..

I look forward to your guidance on this.
Many thanks.