I am working on a cart that will only have 1 item and I do not want the cart to be cumulative or allow the customer to go back and add another item to the cart. I need the carts contents to be "flushed" each time an add to cart is done. I want it to forget whatever was in the cart and only use the new add to cart.

Has anyone done anything similar?

I am writing a reservation system and the qty will be dictated by date code I am writing. The cart will be "fed" the qty from my code. I am worried that if they back up to make a change the cart will add the changed qty.

Hope I am making sense.

Thanks
Steve