extra-properties

Extra is a dictionary of extra information that provides useful such as e-com properties

STT	Field	Type	Description	Sample
1	order_id	String	User's order ID
2	revenue	Number	Total gross merchandise value (in VND, USD,...) of the order.	1000000
3	discount_amount	Number	Total discount value (in VND, USD,..) of the order	10000
4	promotion_code	String	The coupon code that is used in the order
5	tax	Number	Percent of tax (%)	10
6	delivery_cost	Number	Cost of delivery value (in VND, USD,..)	200000
7	src_search_term	String	Search term that leads to this product view
8	any_fields...	Any	Any fields to add to extra

Data structure sample

extra: {
        "order_id": "977895452",
        "revenue": 4999000,
        "discount_amount": 0,
        "promotion_code": ""
    }