How does Consumable IAP works?

So i've been searching and don`t find how consumable purchases exactly works, i saw on this post that the user could't purchase another consumable if it was not consume (which is what i want to our project) but in the same post someone link a documentation url that is shutted down (so i could't chek it)

Can you buy multiple consumables? When you buy one consumable on the store, can you buy more? Is it limited to 1 consumable or is it even posible to configure that on the Add-ons window on the developer dashboard?

On the dashboard i can only set the name, the type (consumable or durable), the show in store option, and then the price and the metadata, but nothing about quantities or adjustments on consumables.