CVM
commented
10 years ago This is a situation that is odd to handle. If the product is discounted (using Catalog Price Rules), you will see the correct total for the line item. However, if the order is discounted (using Shopping Cart Price Rules) as far as Magento is concerned the product itself was not discounted - it just subtracts the discount amount from the order total. This results in the scenario you describe, where the sum of the product totals is more than the transaction total.
Googling the subject, I can see that a lot of people in the GA community are not quite sure what to do about discounts, as the syntax of the transaction request does not accommodate it. There appears to be no word from Google on the subject either.
I would guess the important thing is that the overall revenue (based on the transaction total) is the important thing to get right, as this will be the top level figure used in most e-commerce reports.
Until such a time that there's an official answer on this, I'd be a bit reluctant to change the logic. At best, I might consider adding a line item for discount with a negative price value and using Magento's description of the specific discount for the product name, provided that this works. For example:
dataLayer = [{
// Most variables trimmed for brevity.
"transactionTotal":30,
"transactionProducts":[{
"name":"Bioshock Infinite",
"sku":"bio-3",
"category":"PC Games",
"price":35,
"quantity":1
},{
"name":"Discount: £5 off all games",
"sku":"discount",
"category":"Discount",
"price":-5,
"quantity":1
}]
}];
phildpearce
Item level revenue (transactionProducts.price) is INCORRECT when a promoCode is applied. The full price is output not the discounted price at item level.
Note: top level TransactionTotal is correct.
Change transactionProducts.price to use "product" instead of "quote item" to fix.