var exampleCallback = function() {
console.log('Order complete!');
};

window.EBWidgets.createWidget({
// Required
widgetType: 'checkout',
eventId: '63785147092',
iframeContainerId: 'eventbrite-widget-container-63785147092',

// 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
});