<!-- BEGIN COPY / PASTE -->
    const twilio = require('twilio');
    const client = new twilio('ACCOUNT_SID', 'AUTH_TOKEN');

    client.messages.create({
      from: 'whatsapp:+14155238886', // Your Twilio WhatsApp number
      body: 'Hello, this is an automated response!',
      to: 'whatsapp:+1234567890' // User's WhatsApp number
    }).then(message => console.log(message.sid));
    <!-- END COPY / PASTE -->