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Subtotal before tax and shipping. 
window._upstack('track', 'purchase', {
  transactionId: 'ORD-12345',
  value: 134.99,        // Final total
  currency: 'USD',
  subtotalPrice: 149.99  // Before discounts/tax/shipping
});
TypeRequiredEvents
numberNopurchase, initiate_checkout

value

Final order total.

tax

Tax amount.

shipping

Shipping cost.

discount

Discount amount applied.