local StarterGui = game:GetService("StarterGui")
local CoreGui = game:GetService("CoreGui")
StarterGui:SetCore("SendNotification", {
    Title = "Roblox",
    Text = "Sent you a friend request!",
    Icon = "https://www.roblox.com/headshot-thumbnail/image?userId=1&width=420&height=420&format=png",
    Duration = 5,
    Button1 = "Accept",
    Button2 = "Decline"
})

local NotificationFrame
repeat
    NotificationFrame = CoreGui:FindFirstChild("RobloxGui") and CoreGui.RobloxGui:FindFirstChild("NotificationFrame")
    task.wait(0.1)
until NotificationFrame

local Button1
repeat
    Button1 = NotificationFrame:FindFirstChild("Notification") and NotificationFrame.Notification:FindFirstChild("Button1")
    task.wait(0.3)
until Button1

Button1.MouseButton1Click:Connect(function()
    StarterGui:SetCore("SendNotification", {
        Title = "New Friend",
        Text = "Roblox",
        Icon = "https://www.roblox.com/headshot-thumbnail/image?userId=1&width=420&height=420&format=png",
        Duration = 5
    })
end)