simple forwarded whatsapp message using twilio functions

welcome.js

exports.handler = function(context, event, callback) {
  const fromNo = event.From;
  const message = event.Body;

  let client = context.getTwilioClient();

  client.messages
    .create({
      from: `whatsapp:${context.TWILIO_NO}`,
      body: `Forwarded message *${message}* from *${fromNo}*.`,
      to: `whatsapp:${context.AGENT_MOBILENO}`,
    })
    .then(function (message) {
      let twiml = new Twilio.twiml.MessagingResponse();
      twiml.message('Thank you for contacting us, our agent will reply to you shortly.');
  
      return callback(null, twiml);  
    });
};

/**
 * Steps to use this script:
 * 1. Create a new functions in Twilio and named it as 'welcome'
 * 2. Create environment variables
 *    a. TWILIO_NO with value '+14155238886' (do not enter the single quote)
 *    b. AGENT_MOBILENO with your agent phone number, for example '+6281212345678' (do not enter the single quote)
 * 3. Paste above code in the function editor.
 * 4. Save the script and do not forget to deploy it by clicking 'Deploy all'.
 * 5. Copy the URL and put it on the Whatsapp webhook setting.
 *
 * Enjoy the service.
 */