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Shipping cost for the order. 
window._upstack('track', 'purchase', {
  transactionId: 'ORD-12345',
  value: 134.99,
  currency: 'USD',
  shipping: 8.00
});
TypeRequiredEvents
numberNopurchase, initiate_checkout, add_shipping_info

shippingTier

Shipping speed/tier selected.

tax

Tax amount.