Google Analytics for E-commerce

Add a “Google Analytics” tag and choose the “Track Type” of Transaction. All the transaction information should be passed via the data layer.

Variable Name	Description	Type
transactionId (Required)	Unique transaction identifier	string
transactionAffiliation (Optional)	Partner or store	string
transactionTotal (Required)	Total value of the transaction	numeric
transactionShipping (Optional)	Shipping charge for the transaction	numeric
transactionTax (Optional)	Tax amount for the transaction	numeric
transactionProducts (Optional)	List of items purchased in the transaction	array of TransactionProduct objects

TransactionProduct Data

Variable Name	Description	Type
name (Required)	Product name	string
sku (Required)	Product SKU	string
category (Optional)	Product category	string
price (Required)	Unit price	numeric
quantity (Required)	Number of items	numeric

Here's an example of how this would look:

	<script>
	dataLayer = [{
	    'transactionId': '1234',
	    'transactionAffiliation': 'Acme Clothing',
	    'transactionTotal': 38.26,
	    'transactionTax': 1.29,
	    'transactionShipping': 5,
	    'transactionProducts': [{
	        'sku': 'DD44',
	        'name': 'T-Shirt',
	        'category': 'Apparel',
	        'price': 11.99,
	        'quantity': 1
	    },{
	        'sku': 'AA1243544',
	        'name': 'Socks',
	        'category': 'Apparel',
	        'price': 9.99,
	        'quantity': 2
	    }]
	}];
	</script>

Place this code before the Google Tag Manager container snippet so that the dataLayer is ready when Google Tag Manager fires the Google Analytics tag asynchronously.

 

If you can’t do this and your data layer is placed below the Google Tag Manager code on the page, add a condition to your rule to wait until the page (DOM) is fully loaded, with the built-in event “gtm.dom”:

If you opt to have the tag fired based on a custom event, you can combine the data and the event push as described in the developer documentation: https://developers.google.com/tag-manager/devguide#multipush 

For another great article about using google tag manger with Ecommerce, go to This guide