Standard Disclaimer: This code is not official GotoWebinar code. It does use their API, but in NO WAY is it supported by GotoWebinar. DO NOT contact GotoWebinar for any support of this code.
API calls for GotoWebinar
This API call GETs a json response of upcoming webinars from your GotoWebinar account.
You will want accounts with Citrix GotoWEbinar/GotoMeeting and as a dev. Links below
http://www.gotomeeting.com/online/webinar?c_name=cas_login&c_prod=GTW&c_pals=web30dnc1310&promotion=web30dnc1310 and https://developer.citrixonline.com/user/register
You will need to use OAuth as well, but for quick testing you can get a OAuth key here: http://citrixonline-quick-oauth.herokuapp.com/
Docs used for this call: https://developer.citrixonline.com/page/authentication-and-authorization