Checkout Widget API: Initialization

gistfile1.html

<?php
define('CHECKOUT_WIDGET_OWNERID', 'TEST-123');
define('CHECKOUT_WIDGET_KEY', 'secret');

$timestamp = time();
$signature = hash_hmac( "sha1", CHECKOUT_WIDGET_OWNERID." ".$timestamp, CHECKOUT_WIDGET_KEY);
?>

<script src="https://checkout.ecwid.com/controlpanel-api.js" type="text/javascript" charset="UTF-8"></script>
<script>
EcwidCheckout.init({
    ownerId: '<?php echo CHECKOUT_WIDGET_OWNERID;?>',
    timestamp: '<?php echo $timestamp;?>',
    hmacsha1: '<?php echo $signature;?>',
    loginUrl: 'http://my.site.com/login.php'
});
EcwidCheckout.OnAPILoaded.add(function() {
        // Checkout Widget API is available, do something
        window.EcwidCheckout.setConfig({
		currency: {precision:2,roundScale:100,prefix:'$',suffix:'',code:'USD'},
		weightUnit: 'POUND',
		storeName: "Test store",
		companyEmail: "sales@example.com",
		storeUrl: "http://www.example.com"
	});
});
</script>