Accepts messages following the Cart Event Data Schema.
| Event | Description | Required Data | 
|---|---|---|
| cart_item_updated | Update to a specific cart item. For example, change in quantity of product associated with cart item. | Cart Item Object | 
| cart_item_added | Addition of a new product to cart. | Cart Item Object (without id) | 
| update_cart_item | Event published by the backend to inform subscribers of updates to a specific cart item. Consumer already have the outdated cart item in application state. | Cart Item Object | 
| add_cart_item | Event published by the backend to inform subscribers to add a new cart item (for a specific user identified by the user_idpresent in the data). | Cart Item Object |