Query criteria for removing items from in-progress shopping cart. In case specified items are to be removed, item Ids and their quantity needs to be provided. If COMMERCE multi-site has been implemented, location ID is a required field. Unique identifier for customer whose shopping cart's items to be removed. Collection of Items with their respective quantity to be removed. If <remove_all_items> is false, this is a required field. Unique identifier of location. The location id is required field in case COMMERCE multi-site has been implemented, otherwise it's optional.