gistfile1.js

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
exports.notifyNewMessage = functions.firestore
  .document('/promotions')
  .onCreate(async (docSnapshot) => {
    const promotion = docSnapshot.data();
    //const recipientId = promotion['recipientId'];
    const title = promotion['title'];
    const payload = {
      notification: {
        title: "Hay una nueva promocion!",
        body: title,
      },
      // data: {
      //   USER_NAME: senderName,
      //   USER_ID: promotion['senderId']
      // }
    }
    const response = await admin.messaging().send(payload);
  })