void smartfreight.validateAddress(
           JSObject address,
           DOMString region,
           DOMString apikey,
           optional Function addressValidatedCallback
        );
        

        <!-- Latest and minified JS -->
        <script src="//api.ifsconnect.net/addressing/client-min-latest.js"></script>
        

        
        // set the address fields to variables
        var deliveryname = document.getElementById('deliveryname');
        var addressline1 = document.getElementById('addressline1');
        var addressline2 = document.getElementById('addressline2');
        var addressline3 = document.getElementById('addressline3');
        var addressline4 = document.getElementById('addressline4');
        var addressline5 = document.getElementById('addressline5');

        // Some constants
        var region = 'AUSTRALIA';
        var sfapikey = 'testing123';

        // Declare the callback
        function addressValidated(o) {
            if (o.valid) {
                document.getElementById('addressvalidinfo').innerHTML = '<img src="greentick.png">Your address is valid';
            } else {
                document.getElementById('addressvalidinfo').innerHTML = '<img src="redcross.png">Your address is not valid. Please try again';
            }
        }

        // Perform validation on an event
        addressline3.onblur = function() {
        
            // Create the address object
            var address = { add3: addressline3.value,
                add4: addressline4.value,
                add5: addressline5.value
            };
        
            // Call the validation function
            smartfreight.validateAddress(address, region, sfapikey, addressValidated);
        };