I am confused on Developer Products?

Please Help me with this I am confused?

-- Put the ID of the DevProduct in place of 19184765
local bloxyColaId = 19184765

-- When a player clicks on the sphere, they will be asked if they wish to purchase the DevProduct
script.Parent.ClickDetector.MouseClick:connect(function(player)
    Game:GetService("MarketplaceService"):PromptProductPurchase(player, bloxyColaId)
end)
-- define function that will be called when purchase finished
MarketplaceService.ProcessReceipt = function(receiptInfo) 

    -- find the player based on the PlayerId in receiptInfo
    for i, player in ipairs(game.Players:GetChildren()) do
        end
    end
        if player.userId == receiptInfo.PlayerId then


            if receiptInfo.ProductId == productId then
                Player.leaderstats.Money.Value = Player.leaderstats.Money.Value + 100
                end
            end

This will not work I am trying to give a player 100 Money if bought the developer Product but when I click the brick it will not pop out a buy item note? Please Help me?