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Total discount amount applied to the order. 
window._upstack('track', 'purchase', {
  transactionId: 'ORD-12345',
  value: 134.99,
  currency: 'USD',
  discount: 35.00
});
TypeRequiredEvents
numberNopurchase, initiate_checkout, add_to_cart

coupon

Coupon code used.

subtotalPrice

Subtotal before discounts.