updateCurrentCartLineItemQuantity( )

Updates the quantity of one or more line items in the current site visitor's cart.

The updateCurrentCartLineItemQuantity() function returns a Promise that resolves when the quantities of the current cart's line items are updated. This endpoint is only for updating the quantity of line items. To entirely remove a line item from the current cart, use removeLineItemsFromCurrentCart(). To add a new line item to the current cart, use addToCurrentCart().

This endpoint checks the amount of stock remaining for this line item. If the specified quantity is greater than the remaining stock, then the quantity returned in the response is the total amount of remaining stock.