Adds a single item to the cart.
The article number of the product to add.
The quantity of the product to add.
OptionalconfigurationId: stringThe configuration ID of the product to add, if not provided this is an up-selling and not a custom made product.
A promise that resolves to true if the item was successfully added, false otherwise.
Handler for adding a single item to the cart. It assumes that TECSAFE layout articles as well as saleschannel native articles can be handed over, e.g. when item-lists have been selected by customer for upselling.