This is dialogflow inline editor code for firebase realtime database

index.js

 'use strict';
 
const functions = require('firebase-functions');



const {WebhookClient} = require('dialogflow-fulfillment');
const {Card, Suggestion} = require('dialogflow-fulfillment');
const admin= require ('firebase-admin');

 admin.initializeApp({
    credential:admin.credential.applicationDefault(),
   databaseURL:'ws://myresturent-wrjlyh.firebaseio.com/'
 });

process.env.DEBUG = 'dialogflow:debug'; // enables lib debugging statements
 
exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
  const agent = new WebhookClient({ request, response });
  console.log('Dialogflow Request headers: ' + JSON.stringify(request.headers));
  console.log('Dialogflow Request body: ' + JSON.stringify(request.body));
 
  function welcome(agent) {
    agent.add(`Welcome to my agent!`);
  }
 
  function fallback(agent) {
    agent.add(`I didn't understand`);
    agent.add(`I'm sorry, can you try again?`);
  }
  
  
function OrderNowFuction(agent){
 const food=agent.parameters.foodvalue;
 const phone =agent.parameters.phonevalue;
 const address=agent.parameters.addressvalue;
 return admin.database().ref('orders').set({
       food_item:food,
       user_phone:phone,
       user_location:address
     });

}
  
  let intentMap = new Map();
  intentMap.set('Default Welcome Intent', welcome);
  intentMap.set('Default Fallback Intent', fallback);
  intentMap.set('OrderNow', OrderNowFuction);
  // intentMap.set('your intent name here', googleAssistantHandler);
  agent.handleRequest(intentMap);
});