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Creative or ad variant name for promotion tracking. 
window._upstack('track', 'view_content', {
  items: [{ id: 'SKU_001', name: 'Running Shoes', price: 89.99 }],
  value: 89.99,
  currency: 'USD',
  creativeName: 'hero_banner_v2'
});
TypeRequiredEvents
stringNoview_content, add_to_cart, purchase
Use creativeName and creativeSlot to track which on-site promotions drive the most conversions.

creativeSlot

Placement position on page.

promotionId

Promotion identifier.