Error code 403 in Google+ api

Question

I got \"error\": { \"errors\": [ { \"domain\": \"usageLimits\", \"reason\": \"dailyLimitExceededUnreg\", \"message\": \"Daily Limit for Unauthenticate

Answer 1

BrettJ's answer will cover most of the bases. However, you will also get this error - even when your credentials are properly authenticated - when the scope is not properly set up. I would check the scope setting in your OAuth dance. Make sure your user is permitted to do the thing your code is trying to help them do.