I'm trying to create some cloud functions to:

1. call Google Directions API using Axios
2. create a document at Firestore based on the API result
3. Return the document reference to my iOS App. (I'm on Blaze plan, pay as you go)

I'm having trouble to create the following functions as my Node / JS knowledge is very basic. Could someone please have a quick a look and let me know what I'm missing?

Obs.: The code is deploying to firebase with no warnings and erros. I'm pretty sure that the problem is the way that I'm trying to return my callbacks.

Thanks in advance

EDIT

I've made a few changes on the code, but I'm still receiving nil on my iOS App. The code is still not creating a document on firestore.

const functions = require('firebase-functions');
const axios = require('axios');
var admin = require("firebase-admin");
admin.initializeApp();


// Func called by iOS App, If user is auth, call google maps api and use response to create a document at firestore
exports.getDistanceAndSavePackage = functions.https.onCall((data, context) => {
  if (!context.auth){ return {status: 'error', code: 401, message: 'Not signed in'} }
  const userId = context.auth.uid;
  const startCoordinates = data.startCoords;
  const endCoordinates = data.endCoords;

  const pkgDocReference = getGoogleRoute(startCoordinates, endCoordinates, res => {  
    console.log('google cloud function has returned');
    let venueId = userId;
    let distance = res.distance.value;
    let resultStartAdd = res.start_address;
    let resultEndAdd = res.end_address;

    const pkgDocRef = createTempPackage(venueId, distance, resultStartAdd, resultEndAdd, resultPkg => {
      return resultPkg
    })
    return pkgDocRef;
  })
  return pkgDocReference;
});



//Create Package Document
function createTempPackage(venueId, distance, startingAddress, endingAddress, callback){
  console.log('Creating temp package');
  const docRef = admin.firestore().doc(`/temp_packages/`)
  docRef.set({ 
    id: docRef.id,
    venue_id: venueId,
    distance: distance,
    starting_address: startingAddress,
    ending_address: endingAddress,
    timestamp: admin.database.ServerValue.TIMESTAMP,
    status: 0
  })
  .then(docRef => {
    console.log('Doc created')
    return callback(docRef);
  }).catch(error => {
    console.log('Error trying to create document')
    return callback(error);
  })
}


  //Call Google directions API
  function getGoogleRoute(startCoords, endCoords, callback){
    axios({
      method: 'GET',
      url: 'https://maps.googleapis.com/maps/api/directions/json',
      params: {
          origin: startCoords,
          destination: endCoords,
          key: 'mykey'
      },
    })
      .then(response => {
          let legs = response.data.routes[0].legs[0];
          return callback(legs);
        })
        .catch(error => {
          console.log('Failed calling directions API');
            return callback(new Error("Error getting google directions"))
        })
  }