Adds multiple items to the cart in bulk.
An array of items to add to the cart, specifying their target line position, article number, quantity, and optional configuration ID.
A promise that resolves to an array of objects indicating the success status for each line position.
Handler for adding multiple items to the cart in bulk. 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.