https://developers.google.com/analytics/devguides/collection/gtagjs/ecommerce
Ecommerce with gtag.js
https://developers.google.com/analytics/devguides/collection/gtagjs/ecommerce
If you use gtag.js as your Google Analytics tag and you have Ecommerce reporting enabled, you can measure ecommerce transactions.
To measure a transaction, send a purchase event with the items in the transaction. For example:
gtag('event', 'purchase', {
"transaction_id": "24.031608523954162",
"affiliation": "Google online store",
"value": 23.07,
"currency": "USD",
"tax": 1.24,
"shipping": 0,
"items": [
{
"id": "P12345",
"name": "Android Warhol T-Shirt",
"list_name": "Search Results",
"brand": "Google",
"category": "Apparel/T-Shirts",
"variant": "Black",
"list_position": 1,
"quantity": 2,
"price": "2.0"
},
{
"id": "P67890",
"name": "Flame challenge TShirt",
"list_name": "Search Results",
"brand": "MyBrand",
"category": "Apparel/T-Shirts",
"variant": "Red",
"list_position": 2,
"quantity": 1,
"price": "3.0"
}
]
});
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Universal Analytics (gtag.js)