Setting up a function for Twilio and GDAX

app.js

// Use dotenv to load environment variables
require('dotenv').config();

// Load Twilio and GDAX
const twilio = require('twilio');
const gdax = require('gdax');

// Set up GDAX for buying crypto
const gdaxClient = new gdax.AuthenticatedClient(
  process.env.GDAX_API_KEY, 
  process.env.GDAX_SECRET, 
  process.env.GDAX_PASSPHRASE, 
  process.env.GDAX_API_ENDPOINT
);

// Set up Twilio client for sending SMS
const twilioClient = twilio(
  process.env.TWILIO_ACCOUNT_SID, 
  process.env.TWILIO_AUTH_TOKEN
);

// Add a handler next