Reverse Enhanced Ecommerce Transaction in Google Analytics

reverse_ga_transaction.js

// Reverse purchase in Google Analytics with Enhanced Ecommerce

// Source: https://support.google.com/analytics/answer/1037443?hl=en

var  items = [
    {
      id: 573, // original ID
      price: "57000.00", // original price
      quantity: "-2500" // negative quantity
    },
    {
      id: 573,
      price: "95181.83",
      quantity: "-2500"
    },
    {
      id: 573,
      price: "163363.64",
      quantity: "-2500"
    },
    {
      id: 550,
      price: "64119.00",
      quantity: "-2500"
    },
    {
      id: 550,
      price: "123288.00",
      quantity: "-2500"
    },
    {
      id: 555,
      price: "143907.84",
      quantity: "-2500"
    },
    {
      id: 550,
      price: "249147.59",
      quantity: "-2500"
    }
  ];
   
  // loop through items
  for(var i = 0; i < items.length; i++){
    var product = items[i];
    // add single items
    ga('ec:addProduct', {
      'id':product['id'],
      'price': product['price'],
      'quantity': product['quantity']
    });
  }
  // add the whole purchase
  ga('ec:setAction', 'purchase', {
    'id': "6425422", // original transaction id
    'revenue': "-896007.75", // negative total
    'tax': "0", // taxes included in the revenue so it's ok to have them at 0
    'shipping': "0" // free shipping
  });