How to make Multiple Developer Products?

I am wondering how to do this. I checked the wiki, but it was all very confusing. I got 4 dev products so far, and like it says in wiki only 1 works.

Local Script

local MarketplaceService = game:GetService("MarketplaceService")
local buyButton = script.Parent
local productId = 104751988
player = game.Players.LocalPlayer 
buyButton.MouseButton1Click:connect(function()
    MarketplaceService:PromptProductPurchase(player, productId)
end)

Server Script:

local MarketplaceService = game:GetService("MarketplaceService")
local productId = 104751988

MarketplaceService.ProcessReceipt = function(receiptInfo)
for i, player in ipairs(game.Players:GetChildren()) do
    if player.userId == receiptInfo.PlayerId then
    if receiptInfo.ProductId == productId then
player.leaderstats.Money.Value = player.leaderstats.Money.Value +500
    return Enum.ProductPurchaseDecision.PurchaseGranted     
end
end
end
end

Im wondering if its possible to name these each something different, like maybe MarketplaceService:PromptProductPurchase2(player, productId).

If there is no easier way, i guess ill just do what it says in wiki. Thanks if you help!