Param Name	Required	Type	Notes
`product_id`	Yes	String	The unique SKU or ID which identifies the product
`name`	No	String	The name of the product
`price`	No	Integer	The unit price of the product in cents
`description`	No	String	A short description of the product
`category`	No	Array(String)	Categories which the product belongs to
`item_qty`	No	Integer	The quantity of the product in the cart
`qty_price`	No	Integer	The total price of the product (price X quantity) in cents
`product_url`	No	String	The URL of the product on your site
`image_url`	No	String	The URL of an image or thumbnail of the product
`expiration_date`	No	Date String	A string representing the date on which the product expires.

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Important Note
The expiration_date field is stored as a proper datetime and is simply used for audience segmenting and display purposes.

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Any additional params will be treated as strings and added to the metadata field of the cart item.