SCRIPT WONT WORK, PLEASE HELP! Script where if players have certain item they get free coins? [closed]

Ok, your not supposed to ask for stuff without showing script but ok.

-- If you do not know how to use this or the GUI, check out my YouTube video tutorial on this. 
-- Replace the 0's with your ID's 
-- Delete what you dont use, besides the first part of the function


game.StarterGui.ResetPlayerGuiOnSpawn = false
old_fog = game.Lighting.FogStart
local MarketplaceService = game:GetService("MarketplaceService")

function getPlayerFromId(id)
    for i,v in pairs(game.Players:GetChildren()) do
        if v.userId == id then
            return v
        end
    end
    return nil
end

MarketplaceService.ProcessReceipt = function(receiptInfo)
    local productId = receiptInfo.ProductId
    local playerId = receiptInfo.PlayerId
    local player = getPlayerFromId(playerId)
    local productName 

    -- Down below is an example of a Cash boost

    -------------------------------------------------------------------

    if productId == 50738839 then
        local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
            if cashmoney then
                cashmoney.Value = cashmoney.Value + 5000
                   end
    elseif productId ==50738869  then
        local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
            if cashmoney then
                cashmoney.Value = cashmoney.Value + 10000
            end
    elseif productId == 50738905 then
        local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
            if cashmoney then
                cashmoney.Value = cashmoney.Value + 20000
            end
    elseif productId == 50738942 then
        local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
            if cashmoney then
                cashmoney.Value = cashmoney.Value + 30000
            end 
    elseif productId == 50738971 then
        local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
            if cashmoney then
                cashmoney.Value = cashmoney.Value + 40000
            end
    elseif productId == 50739005 then
        local cashmoney = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
            if cashmoney then
                cashmoney.Value = cashmoney.Value + 99999999999
            end




        -------------------------------------------------------------------

        -- Down below is an example of a Health boost

        -------------------------------------------------------------------
        elseif productId == 52085900 then
        local char = player.Character
        if char then
            local human = char:FindFirstChild("Humanoid")
            if human then
                human.WalkSpeed = human.WalkSpeed + 15
            end
        end
        -------------------------------------------------------------------

        -- Down below is an example of a WalkSpeed boost

        -------------------------------------------------------------------
        elseif productId == 52086187 then
        local cashmoney = game.ServerStorage.MoneyStorage:FindFirstChild(player.Name)
        local char = player.Character
        char.Humanoid.MaxHealth = char.Humanoid.MaxHealth + 30
        wait()
        char.Humanoid.Health = char.Humanoid.MaxHealth
        -------------------------------------------------------------------

        -- Down below is an example of a gear giver

        -------------------------------------------------------------------

        elseif productId == 52086215 then
        game.ServerStorage.Rainbow:Clone().Parent=player.Backpack

        -------------------------------------------------------------------
    end
    return Enum.ProductPurchaseDecision.PurchaseGranted     
end