post https://inbound-analytics.pixlee.com/events/addToCart
This event should be fired when a user adds things to their shopping cart.
{
"uid": "d284fb3c-5c29-e316-ed71-8ce7852f8e50", //required, any unique string that tracks the user currently browsing
"parentURL": "https://referral-url.com", //optional but recommended, the URL on which the user loaded the widget
"API_KEY": "abcdefg", //required, the Pixlee ACCOUNT PRIVATE API KEY
"product_sku": "SL-BENJ", //required, the sku of the product being added to cart
"price": '13.00', //required, the price of the item being added to cart
"quantity": 1, // required, the number of items added to cart
"currency": "USD" // required, the ISO 4217 currency code
}