My pay to open gui script is not working

Help and Feedback Scripting Support
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#1

Hello, my pay to open Gui script is not working, here are my scripts, one local and the other server. It works like this a devproduct is prompted to be purchased when someone clicks a Gui button, and when you complete a purchase, it does not open the gui, here are my scripts: (on the server one I did’t know what to put after, that’s probably where my mistakes came in)

> Local: local mps = game:GetService("MarketplaceService")
> local plr = game.Players.LocalPlayer
> local id = 1178903400
> local FeedbackMain = script.Parent.Parent.FeedbackMain
> script.Parent.MouseButton1Click:Connect(function()
> 	mps:PromptProductPurchase(plr, id)
> 	end)

Server:

local mps = game:GetService("MarketplaceService")
mps.ProcessReceipt = function(receiptInfo)
	if receiptInfo.ProductId == 1178903400 then
		local Player = game.Players:GetPlayerByUserId(receiptInfo.PlayerId)
		
	end
end
#2

Could be a few things:

1- marketplaceService.ProcessReceipt expects a ProductPurchaseDecision enum to be returned.
2- You aren’t ever telling the client to open the UI. This is probably best done by a remote event:

local mps = game:GetService("MarketplaceService")
local replicatedStorage = game:GetService('ReplicatedStorage')
local myRemoteEvent = replicatedStorage.RemoteEvent
mps.ProcessReceipt = function(receiptInfo)
	if receiptInfo.ProductId == 1178903400 then
		local Player = game.Players:GetPlayerByUserId(receiptInfo.PlayerId)
		remoteEvent:FireClient(player)
        return Enum.ProductPurchaseDecision.PurchaseGranted
	end
end

Then on the client,

local mps = game:GetService("MarketplaceService")
local replicatedStorage = game:GetService('ReplicatedStorage')
local myRemoteEvent = replicatedStorage.RemoteEvent
local myUI = script.Parent.ScreenGui.Frame
myRemoteEvent.OnClientEvent:Connect(function()
    myUI.Visible = true
end)
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