dataLayer.push({ ecommerce: null });
dataLayer.push({
    event: 'begin_checkout',
    ecommerce: {
        items: [
            {
                item_id: 'BUNDLE_11',
                item_name: 'KAUFOPTION\u003A\u0020Shadowboxer\u0020G\u00FCrtel\u0020Paket',
                currency: 'USD',
                price: 299,
                quantity: 1
            }
        ]
    }
});