YouTube subscriber count with YouTube Data API V3

Previously I was getting a YouTube channel subscriber count with YouTube data API v2.

I used the following (I am using the TED channel for demo purposes):

http://gdata.youtube.com/feeds/api/users/TEDtalksDirector?alt=json&callback=jQuery111202977260369807482_1433828589506&jsonp&_=1433828589507

However, with the new v3 API, there isn’t any subscriber count in the result.

https://www.googleapis.com/youtube/v3/subscriptions?part=snippet%2CcontentDetails&channelId=UCAuUUnT6oDeKwE6v1NGQxug&key=fhjfshdjfhsjdhfjshdjfhsjdfhsjdhfjshdjfhsjdhs

Is there a way in which I can get the subscriber count value?