var exampleCallback = function() { console.log('Order complete!'); }; window.EBWidgets.createWidget({ // Required widgetType: 'checkout', eventId: '1221607854979', iframeContainerId: 'eventbrite-widget-container-1221607854979', // Optional iframeContainerHeight: 425, // Widget height in pixels. Defaults to a minimum of 425px if not provided onOrderComplete: exampleCallback // Method called when an order has successfully completed });