Sample Script to use AddressFinder to fill Gravity Forms Advanced Address field individual address fields - address 1, city, state, postcode

addressFinder-GravityForms-script.js

// see original doco here - https://github.com/AddressFinder/addressfinder-gravity-forms
// change field ids to suit your form fields.. 
// this not processing the country field...

<script>
(function() {
    var widget, initAddressFinder = function() {
        widget = new AddressFinder.Widget(
            document.getElementById('input_1_3_1'),
            'YOUR_KEY',
            'AU', {
                "address_params": {
                    "gnaf": "1"
                }
            }
        );

        widget.on('address:select', function(fullAddress, metaData) {
            document.getElementById('input_1_3_1').value = metaData.address_line_1;
            document.getElementById('input_1_3_3').value = metaData.locality_name;
            document.getElementById('input_1_3_5').value = metaData.postcode;
            document.getElementById('input_1_3_4').value = metaData.state_territory;
        });


    };

    function downloadAddressFinder() {
        var script = document.createElement('script');
        script.src = 'https://api.addressfinder.io/assets/v3/widget.js';
        script.async = true;
        script.onload = initAddressFinder;
        document.body.appendChild(script);
    };

    document.addEventListener('DOMContentLoaded', downloadAddressFinder);
})();
</script>