Zendesk FCM Cloud Function

index.ts

import * as functions from 'firebase-functions'
const admin = require('firebase-admin')
admin.initializeApp(functions.config().firebase)

export const pushUpdates = functions.https.onRequest((request, response) => {
    const tokens = request.body.devices.map(d => d.identifier)
    const payload = {
        data: {
            title: request.body.notification.title,
            ticket_id: request.body.notification.ticket_id
        }
    }
    
    return admin.messaging().sendToDevice(tokens, payload)
})