I've been reading youtube API in orde to find how could I retrieve videos and relavant data about them using a certain query. I've found this page - https://developers.google.com/youtube/2.0/developers_guide_protocol_api_query_parameters where there is an example of: https://gdata.youtube.com/feeds/api/videos?q=surfing&caption&v=2
My question is where should I use my API key ? I don't see any section for this in the query above.
Thanks.