Page History

{
	"event": "checkout",
	"event_type": "checkout",
	"ecommerce": {
		"checkout": {
			"actionField": {
				"step": 1
			},
			"products": [
			{
				"name": "Product Description",
				"id": "ProductCode",
				"category": "/first level/second level/third level",
				"brand": "brand name",
				"price": "99.99"
			}
			]
		}
	}
}

{
	"event": "checkoutOption",
	"event_type": "checkout",
	"ecommerce": {
		"checkout_option": {
			"actionField": {
				"step": 1,
				"option": "Cart"
			}
		}
	}
}