I have a website where is discussion is happening among some people with valid gmail ids. If one of them in the discussion clicks on the google hangout button, I need to start a
To the best of my knowledge (and more than willing to be corrected), there isn't a way to trigger a hangout with a set of participants. There is a bit of a hack using the calendar API though - you could create a calendar entry in a calendar set to automatically create hangouts, and invite everyone that way. I had an old blog post on it: http://www.riskcompletefailure.com/2012/11/programmatically-scheduling-hangouts.html