Can someone help with my cash giver button? Will explain more below!

My script gives me cash but for some reason it wont let me spend it in game to buy droppers!

local ting = 0

function onTouched(hit)
    if ting == 0 then 
    ting = 1
    check = hit.Parent:FindFirstChild("Humanoid")
    if check ~= nil then 

        local user = game.Players:GetPlayerFromCharacter(hit.Parent)
        local stats = user:findFirstChild("leaderstats")

        if stats ~= nil then 
            local cash = stats:findFirstChild("Cash")
            cash.Value  = cash.Value  +500 
        wait(5)
        end 
    end 
    ting = 0
    end 

end 

script.Parent.Touched:connect(onTouched)

This is the script in my button, I can buy it and it gives me the cash, but for some reason I can't spend the cash :/

local productId = 36415601  
local player = game.Players.LocalPlayer

script.Parent.MouseButton1Click:connect(function()
    Game:GetService("MarketplaceService"):PromptProductPurchase(player, productId)
end)