Hi @mrtahirhassan01,
Unfortunately, the GazChaps plugin is not compatible with Fluid Checkout.
Adding compatibility with it is not currently planned as it would require changes in the JavaScript files from the GazChaps’ plugin.
The problem is that the original JavaScript files are minified, which makes it almost impossible to understand and make small changes.
I suggest you get in contact with the GazChaps team to ask them to add compatibility from their side.
Alternatively, our Google Address Autocomplete can also be used to search addresses by the Postcode, although, it would use the Google Places API instead of getAddress.io. We have plans to use getAddress.io in the future to autocomplete addresses as a feature in this plugin.
Best,
Diego