Как подключить чат-бот facebook messenger к базе данных mongodb, чтобы публиковать запросы и получать ответы, взаимодействуя с ботом messenger

if (received_message.text) {
// Get the URL of the message attachments

response = {
  attachment: {
    type: "template",
    payload: {
      template_type: "generic",
      elements: [
        {
          title: "Welcome to Flying Sphaghetti Monster Restaurant!",
          subtitle: "Choose any of the options below.",
          image_url:
            "https://content3.jdmagicbox.com/comp/hyderabad/h5/040pxx40.xx40.140516124003.h3h5/catalogue/flying-spaghetti-monster-restaurant-jubilee-hills-hyderabad-home-delivery-restaurants-p6kmmr.jpg",
          default_action: {
            type: "web_url",
            url:
              "https://content3.jdmagicbox.com/comp/hyderabad/h5/040pxx40.xx40.140516124003.h3h5/catalogue/flying-spaghetti-monster-restaurant-jubilee-hills-hyderabad-home-delivery-restaurants-p6kmmr.jpg",

            webview_height_ratio: "tall"
          },
          buttons: [
            {
              type: "postback",
              title: "Walkin!",
              payload: "A"
            },
            {
              type: "postback",
              title: "Reserve table!",
              payload: "B"
            },
            {
              type: "postback",
              title: "Feed back!",
              payload: "C"
            }
          ]
        }
      ]
    }
  }
};

else if (received_message.attachments){ let attachment_url = received_message.attachments[0].payload.url;
response = {
  attachment: {
    type: "template",
    payload: {
      template_type: "generic",
      elements: [
        {
          title: "What this picture is for?",
          subtitle: "Tap a button to answer.",
          image_url: attachment_url,
          buttons: [
            {
              type: "postback",
              title: "Review!",
              payload: "yes"
            },
            {
              type: "postback",
              title: "Suggestion!",
              payload: "yeah"
            }
          ]
        }
      ]
    }
  }  callSendAPI(sender_psid, response);
};}

Вот как я обрабатываю постбэки...

function handlePostback(sender_psid, received_postback) { let response; let payload = received_postback.payload;

if (payload === "A")

{

response = {
  attachment: {
    type: "template",
    payload: {
      template_type: "generic",
      elements: [
        {
          title: "you have choosen for walkin!",
          subtitle: "please choose these available walkins!.",
          image_url:
            "https://content3.jdmagicbox.com/comp/hyderabad/h5/040pxx40.xx40.140516124003.h3h5/catalogue/flying-spaghetti-monster-restaurant-jubilee-hills-hyderabad-home-delivery-restaurants-p6kmmr.jpg",
          default_action: {
            type: "web_url",
            url:
              "https://content3.jdmagicbox.com/comp/hyderabad/h5/040pxx40.xx40.140516124003.h3h5/catalogue/flying-spaghetti-monster-restaurant-jubilee-hills-hyderabad-home-delivery-restaurants-p6kmmr.jpg",

            webview_height_ratio: "tall"
          },

          buttons: [
            {
              type: "postback",
              title: "4 PM",
              payload: "a"
            },
            {
              type: "postback",
              title: "5 PM",
              payload: "b"
            },
            {
              type: "postback",
              title: "6 PM",
              payload: "c"
            }
          ]
        }
      ]`