text: console.log("++ Create a webhook filter list for a Conversation.");
  var client = require('../../node_modules/twilio')(process.env.MASTER_ACCOUNT_SID, process.env.MASTER_AUTH_TOKEN);
  
  conversationSid = process.env.CONVERSATION_SID;
  filterList = ['onMessageAdded', 'onParticipantAdded', 'onParticipantRemoved'];
  console.log("+ Conversation SID: " + conversationSid
          + "\n+ filterList: " + filterList
          + "\n+ Webhook URL: " + process.env.ECHO_REQUEST_URL
          );
  client.conversations.conversations(conversationSid)
          .webhooks
          .create({
              'configuration.filters': filterList,
              'configuration.url': process.env.ECHO_REQUEST_URL,
              'configuration.method': 'GET',
              target: 'webhook'
          })
          .then(webhook => console.log(
                      "+ Created webhook, SID: " + webhook.sid
                      ));
              
  // Each individual Conversation can have as many as five such webhooks, as needed for your use case.
  // https://www.twilio.com/docs/conversations/api/conversation-scoped-webhook-resource?code-sample=code-create-attach-a-new-conversation-scoped-webhook&code-language=Node.js&code-sdk-version=3.x
  // 
  // target: The target of this webhook: webhook, studio, trigger
  // "filters" 
  // https://www.twilio.com/docs/conversations/api/webhook-configuration-resource
  // "filters": The list of webhook event triggers that are enabled for this Service:
  //   onConversationUpdated, onConversationRemoved, 
  //   onParticipantAdded, onParticipantUpdated, onParticipantRemoved
  //   onMessageAdded, onMessageUpdated, onMessageRemoved, 
  
  