How do I get this to work?

So all I want to be able to do is print a developer product's name in the output!

Here is what I have so far:

local function GetName() return game:GetService("MarketplaceService"):GetProductInfo(19183418).Name end

wait(1)
print(GetName())

My problem is it keeps using item/place IDs instead of the developer product's IDs. Can someone please tell me how to fix this?