I have a product I would like to sell in multiples of 500 only. I've got a form set up so the customer chooses from a drop-down list of quantities, but when they get to the cart or checkout screen, they can change the quantity to be anything. Is there a way to restrict that?
I found the drop-down list answer here: https://forum.foxycart.com/discussion/6438/ordering-only-in-multiples-of-a-certain-qty/p1
but it's clearly for an older version of Foxycart, so maybe it's not that simple anymore. I'm using 2.0.