HTTPService with Discord Webhook API Example

local url = "" --webhook url here
local HTTP = game:GetService("HttpService")

game.Players.PlayerAdded:Connect(function(plr)
    local data = {
        ["embeds"] = {{
            ["author"] = {
                ['name'] = plr.Name,
                ['icon_url'] = "https://www.roblox.com/Thumbs/Avatar.ashx?x=100&y=100&username="..plr.Name
            },

            ["description"] = plr.Name.." has joined the game.",
            ["color"] = 786176,
            ["url"] = "https://www.roblox.com/users/"..plr.UserId.."/profile",

            ["fields"] = {
                {
                    ['name'] = "Account Age",
                    ['value'] = tostring(plr.AccountAge),
                    ['inline'] = true
                },

                {
                    ['name'] = "User ID",
                    ['value'] = tostring(plr.UserId),
                    ['inline'] = true
                }
            }
        }}
    }

    data = HTTP:JSONEncode(data)
    HTTP:PostAsync(url, data)
end)