What pizza delivery place would actually try to deliver 1000 pizza's?

In college I worked a pizza joint. 300 pizza orders were not uncommon, but anything over 200 dollars got a callback to make sure it was legit. But hey, if the card clears, noone cares.

Any pizza place in a city where it’s common that a school or a professor would order hundreds of pizzas.

Our high school, due to having no cafeteria for a while, ordered once or twice a week hundreds of pizzas from several pizza places.

And we have a professor at our university who always promises to give everyone free pizza if more than 25% of the class are still there the week before the exam. Sometimes it works, sometimes too many fail.

But ordering many pizzas, especially online, is possible.

Although some places will call you back to confirm

Fine, 10. Your $20 order just became $200.

Easily solved, though, by adding additional confirmation steps if the amounts are above a certain level or the order deviates from your usual patterns. I look forward to giving Star Trek type authorization codes when ordering pizzas...