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Core properties are the foundational fields used across most tracking events. These are typically required or strongly recommended for proper attribution and reporting.

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Properties

value

Monetary value of the event.

currency

ISO 4217 currency code.

transactionId

Unique order identifier.

orderName

Human-readable order number.

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Quick Reference

PropertyTypeRequiredDescription
valuenumberYes for purchase, lead, subscribeMonetary value of the event
currencystringYes (when value is set)ISO 4217 currency code (USD, EUR, GBP)
transactionIdstringYes for purchase/refundUnique order identifier
orderNamestringNoHuman-readable order number shown to customers

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Example

window._upstack('track', 'purchase', {
  value: 149.99,
  currency: 'USD',
  transactionId: 'ORD-2026-001',
  orderName: '#1042',
  items: [/* ... */]
});
For Purchase events, value should match the order total you want reported to ad platforms.