[STILL UNANSERWED] Buying in game currency script help?

local productId = 20983086 
local player = game.Players.LocalPlayer

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




if plr and plr:FindFirstChild"leaderstats" and plr.leaderstats:FindFirstChild"Credits" then
plr.leaderstats.Credits.Value = plr.leaderstats.Credits.Value + script.Parent.Name 
end

Hey, so i have this code, were the player buy '50 credits' which i have as a developer product it opens up okay but when bought, it doesn't give the player the sed amount they bought and i don't know how to change the script to make it happen.

I don't know if you'll need it but this is the leader board, which is also working properly

function onPlayerEntered(newPlayer) 

	local stats = Instance.new("IntValue") 
	stats.Name = "leaderstats"

	local robux = Instance.new("IntValue") 
	robux.Name = "Credits"
	robux.Value = 0  						
	robux.Parent = stats 
		stats.Parent = newPlayer 
end 
game.Players.ChildAdded:connect(onPlayerEntered) 

I don't know if this might help but here.

if plr and plr:FindFirstChild("leaderstats")--Put Brackets between the text
plr.leaderstats:FindFirstChild("Credits") then
plr.leaderstats.Credits.Value = plr.leaderstats.Credits.Value + script.Parent.Name
end

what you can also do is that after they purchase the "50 credits" pass for robux, make them able to go in the vip room that has a botton that u step on for 50 credits, but then it teleports u back and u cant take another one. making a vip only room is very easy and can be found in free models