Google Enhanced Ecommerce (Universal Analytics, never migrated)

// Universal Analytics stopped processing new hits in 2024 — this pattern is
// already fully dead, independent of the Aug 26 checkout change. There is no
// UA-shaped replacement; the correct fix is a full switch to GA4 Measurement
// Protocol, same as the ga4-gtag-purchase-checkout-liquid template. Shown
// here as its own entry because the detection signature (ga('ec:...')) is
// distinct and merchants searching for "enhanced ecommerce" still find this
// dead pattern in old themes.
analytics.subscribe('checkout_completed', (event) => {
  const { checkout } = event.data;
  if (!checkout || !checkout.totalPrice) return;

  fetch(`https://www.google-analytics.com/mp/collect?measurement_id=MEASUREMENT_ID&api_secret=API_SECRET`, {
    method: 'POST',
    keepalive: true,
    body: JSON.stringify({
      client_id: event.clientId,
      events: [{
        name: 'purchase',
        params: {
          transaction_id: checkout.order ? checkout.order.id : checkout.token,
          value: checkout.totalPrice.amount,
          currency: checkout.totalPrice.currencyCode,
          items: checkout.lineItems.map((item) => ({
            item_id: item.variant && item.variant.id,
            item_name: item.title,
            quantity: item.quantity,
            price: item.variant ? item.variant.price.amount : undefined,
          })),
        },
      }],
    }),
  });
});

Legacy pattern detected via: ga\(\s*['"]ec:(addProduct|setAction)['"]|ga\(\s*['"]send['"]\s*,\s*['"]pageview['"]