これは https://blog.r3it.com/ に投稿した Alexa プッシュ通知の 送信例Lambda Functionです。 https://blog.r3it.com/alexa-day-2018-73928e3b3923

AlexaPushNotificationSend.js

'use strict';
const Alexa = require('alexa-sdk');
const request = require('request');

exports.handler = function(event, context, callback) {

    const requestBody = {
        "grant_type": "client_credentials",
        "client_id": process.env.clientid,
        "client_secret": process.env.secret,
        "scope": "alexa:skill_messaging"
    };

    const request_options = {
        "Content-Type": "application/x-www-form-urlencoded",
        url: `https://api.amazon.com/auth/O2/token`,
        method: "POST",
        gzip: false,
        json: requestBody
    };

    request(request_options, function(error, response, body) {
        console.log("[client_credentials] error: ", JSON.stringify(error, null, 2));
        console.log("[client_credentials] response: ", JSON.stringify(response, null, 2));
        console.log("[client_credentials] body: ", JSON.stringify(body, null, 2));

        const requestid = response.headers["x-amzn-requestid"];
        const SKILL_MESSAGING_TOKEN = body["access_token"];

        const ALEXA_USER_ID = process.env.ALEXA_USER_ID;
        const requestBody = {
            "data": {
                "notificationTitle": "HelloTitle",
                "spokenOutput": 'プッシュ通知を送ります。</lang>'
            },
            "expiresAfterSeconds": 60
        };

        // POST
        const request_options = {
            "Content-Type": "application/json; charset=UTF-8",
            url: `https://api.fe.amazonalexa.com/v1/skillmessages/users/${ALEXA_USER_ID}`,
            method: "POST",
            gzip: false,
            headers: {
                "Authorization": `Bearer ${SKILL_MESSAGING_TOKEN}`
            },
            json: requestBody
        };

        request(request_options, function(error, response, body) {
            console.log("[skillmessages] error: ", JSON.stringify(error, null, 2));
            console.log("[skillmessages] response: ", JSON.stringify(response, null, 2));
            console.log("[skillmessages] body: ", JSON.stringify(body, null, 2));

            return callback(null, {
                statusCode: response.statusCode,
                body: JSON.stringify(response),
                headers: {
                    "Content-Type": "application/json; charset=utf-8"
                },
            });
        });

    });

};