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For developer notice, if you have are trying to access the JSON feed but you get security errors, try loading from api.kongregate.com instead of www.kongregate.com.
Since this is an easy and subtle mistake to make, even though UnknownGuardian figured it out, I'll go ahead and explain it. A single user_id request should be for the parameter "user_id", but if you want multiple you need to use "user_ids", with an "s" at the end. Same thing applies to username(s).
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It's a good way to authenticate a user by using user_info.json instead of authenticate.json? The reason why I prefer user_info.json is because I want to get the user avatar url. Since the avatar_url is not provided in the client function list, user_info.json is the single way to get a user avatar. So my question is: user_info.json is a trusted source to authenticate a user?
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Requesting more than 50 user ids doesn't seem to work. It seems you have to do it in batches... worth a note in the doc ;)
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Is there a way to find out if a user has played your game so that you can filter out friends who have not played your game?
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Adding &friends=true to a user_ids reset does not return the list of friend's friends. This would be very usefull for knowing if the players are friends or simply a fan.
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It doesn't work form me too in JavaScript.
http://www.kongregate.com/forums/90-kongregate-apis/topics/513425-cant-load-user-info-json-in-javascript