code: function V1(domain) {
    Version.prototype.constructor.call(this, domain, 'v1');
  
    // Resources
    this._sessions = undefined;
    this._services = undefined;
    this._webhooks = undefined;
  }
docs: /* jshint ignore:start 
  Initialize the V1 version of Messaging
  
  @constructor Twilio.Messaging.V1
  
  @property {Twilio.Messaging.V1.SessionList} sessions - sessions resource
  @property {Twilio.Messaging.V1.ServiceList} services - services resource
  @property {Twilio.Messaging.V1.WebhookList} webhooks - webhooks resource
  
  @param {Twilio.Messaging} domain - The twilio domain
   /* jshint ignore:end