CartData

Contains additional information about cart data.

Fields
merchant_id	int64 The Merchant Center ID where the items are uploaded.
feed_country_code	string The country code associated with the feed where the items are uploaded.
feed_language_code	string The language code associated with the feed where the items are uploaded.
local_transaction_cost	double Sum of all transaction level discounts, such as free shipping and coupon discounts for the whole cart. The currency code is the same as that in the ClickConversion message.
items[]	Item Data of the items purchased.