That didn't take long, eh?
According to The Seattle Times, the first time you visit one of the two AmazonFresh Pickup locations, a concierge will enter your name and vehicle's license plate number into Amazon's systems. That way, during subsequent visits a license plate reader will automatically identify you and signal to employees that they should bring your order out to your car.
What is interesting/alarming is not that this can be done, but that it can be done for $14 a month. If you want to wait two hours for your order to be picked, you don't have to pay at all.
Currently they have kids running around inside picking the orders. I predict not for long. Next thing will be to fire ALL the staff and robots do it all.