local Players = game:GetService("Players")
local StarterGui = game:GetService("StarterGui")

local callback = Instance.new("BindableFunction")
--place ur id on the number(1)
local thumb, isReady = Players:GetUserThumbnailAsync(1, Enum.ThumbnailType.HeadShot, Enum.ThumbnailSize.Size420x420)

local data = {
Title = "Unknown",
Text = "sent you a friend request!",
Icon = thumb,
Duration = 8,
Button1 = "Accept",
Button2 = "Decline",
Callback = callback
}

--make the fake friend notifications
StarterGui:SetCore("SendNotification", data)

--callback on the button
callback.OnInvoke = function(button)
if button:lower() == "accept" then
print("accepted the friend request from Unknown ")
-- You can add script
elseif button:lower() == "decline" then
print("declined the friend request from Unknown")
-- You can add a script
end
end