pushNotifications.js

var functions = require('firebase-functions');
var admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
exports.sendNotification = functions.database.ref('/promotions/{promotion}')
  .onCreate((snapshot, context) => {
    const promotion = snapshot.val();
    //const promotionId = promotion['id'];
    const title = promotion['title'];
    var topic = "all";
    var payload = {
      notification: {
        title: "Hay una nueva promocion!",
        body: title,
        // data: {
        //   id: promotionId,
        // }
      }
    };
    return admin.messaging().sendToTopic(topic, payload)
      .then(function (response) {
        console.log("Successfully sent message:", response);
      })
      .catch(function (error) {
        console.log("Error sending message:", error);
      });
  });