https://tomacheese.com/blog/kouhaku_notice_program/

ifttt.php

<?php
// https://tomachi.jpn.ph/blog/discordmessagesend/
function DiscordMessageSend($channelid, $message, $embed = null){
    $token = "TOKEN";
    $data = array(
        "content" => $message,
        "embed" => $embed
    );
 
    $header = array(
        "Content-Type: application/json",
        "Content-Length: ".strlen(json_encode($data)),
        "Authorization: Bot ".$token,
        "User-Agent: DiscordBot (http://example.com, v0.0.1)"
    );
 
    $context = array(
        "http" => array(
            "method"  => "POST",
            "header"  => implode("\r\n", $header),
            "content" => json_encode($data)
        )
    );
    $context = stream_context_create($context);
    $contents = file_get_contents("https://discordapp.com/api/channels/".$channelid."/messages", FALSE, $context );
}

// https://github.com/book000/etc/blob/master/DiscordEmbed.class.php
require_once("DiscordEmbed.class.php");

$json = file_get_contents("php://input"); // ポストされたデータを取得
$json = str_replace("\n", "\\n", $json); // 改行を修正
$data = json_decode($json, true); // jsonをオブジェクトに変換

if ($data["appname"] != "NHK KOUHAKU") {
    exit; // アプリ名がNHK KOUHAKUでなければ終了
}

$message = $data["message"]; // メッセージ取得
$messages = explode("\n", $message); // 改行で分割

$message = $messages[0]; // メッセージの一行目を取得

if (mb_substr($message, 0, 4) != "まもなく") {
    exit; // 「まもなく」という文字列から始まらなければ終了
}

// DiscordEmbed作成
$embed = new DiscordEmbed();
$embed->setTitle("紅白歌合戦");
$embed->setUrl("https://www.nhk.or.jp/kouhaku/");
$embed->setDescription("紅白歌合戦の情報をお伝えします。\n(NHK紅白アプリでの通知から自動投稿)");


$embed->addFields("情報", $message, false);

DiscordSendSelect("CHANNEL ID", "", $embed->Export());