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content_ids is not a user-input property. It is automatically derived from your items array during event forwarding.

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How It Works

When you send events with an items array, the platform extracts product IDs and forwards them as content_ids to advertising platforms (Meta, TikTok, etc.). Do this: 
window._upstack('track', 'view_content', {
  items: [
    { id: 'SKU-001', name: 'Running Shoes', price: 99.00 },
    { id: 'SKU-002', name: 'Athletic Socks', price: 12.00 }
  ]
});
// → Forwards content_ids: ['SKU-001', 'SKU-002'] to destinations
Not this: 
// ❌ Don't pass content_ids directly
window._upstack('track', 'view_content', {
  content_ids: ['SKU-001', 'SKU-002']
});

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Derivation Logic

The platform extracts IDs from the items array using this priority:
  1. item.id (preferred)
  2. item.item_id
  3. item.product_id
  4. item.sku
  5. item.variant_id

Items Array

Pass product data here — IDs are extracted automatically.

searchTerm

User-input property for search queries.