Citrix’s GoToWebinar is revolutionary product for online marketing. It has wonderful email management system and custom tempting system for the front end. You can find out more about http://www.gotomeeting.com/fec/webinar. Citrix Online also has multiple of APIs for GoToWebinar. You can see all the APIs on https://developer.citrixonline.com/api-overview/gotowebinar-rest-api. Citrix Online supports OAuth 2.0 for authentication of user accounts and authorization of applications. According to https://developer.citrixonline.com/forum/resolved-enhancement-oauth-token-expiration-time-extended the access token last one year!!! The disappointing thing is there is no official library. So I decided to write one myself.