To ensure that the Littledata script is loading on your Zipify landing pages, you'll need to visit your Zipify page settings to check if “Use theme header / footer” is turned on or off.
If ON, then no action is required. Your store uses theme.liquid file, where the Littledata script has already been injected.
If OFF, then follow the steps below to add the Google Analytics tracking code.
That's it! You're all set.