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Coupon or promo code used. 
window._upstack('track', 'purchase', {
  transactionId: 'ORD-12345',
  value: 134.99,
  currency: 'USD',
  coupon: 'SAVE25'
});
TypeRequiredEvents
stringNopurchase, initiate_checkout, add_to_cart

discount

Discount amount applied.

promotionId

Promotion identifier.