A pop-up ad online from a grocery store sets out "During this Covid19 outbreak, free delivery on orders over $50". In response to the ad, Harub goes to the grocery store website, puts groceries in his online "shopping cart" and checks out. The website sends an auto-generated message as follows "your order has been received, your credit card has been charged, thanks for shopping with us" After the groceries are delivered, Harub decides that he has purchased too much toilet paper and he wants to "get out" of this agreement.

Fully discuss consensus and consideration, using relevant legal terminology, including whether or not there is a valid contract.