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Human-readable order name (e.g., the order number shown to customers). 
window._upstack('track', 'purchase', {
  transactionId: 'shopify_order_5678901234',
  orderName: '#1042',  // What the customer sees
  value: 149.99,
  currency: 'USD'
});
TypeRequiredEvents
stringNopurchase

transactionId

Unique order identifier for tracking.