title: Google Simple API key stopped working
body: <p>I'm using Python/Twisted to do asynchronous HTTP calls to the Google+ API. Our client app passes over the user's access_token and we do an API call to...</p>
  
  <pre><code>https://www.googleapis.com/plus/v1/people/me/?%s&amp;key=%s&amp;
  </code></pre>
  
  <p>... where %s and %s are being filled with a valid access_token and (supposedly) valid Simple API Key, respectively.</p>
  
  <p>Everything was working beautifully yesterday. Today I continued to work on the unit tests for this when the API suddenly started returning:</p>
  
  <pre><code>{
   "error": {
    "errors": [
     {
      "domain": "usageLimits",
      "reason": "keyInvalid",
      "message": "Bad Request"
     }
    ],
    "code": 400,
    "message": "Bad Request"
   }
  }
  </code></pre>
  
  <p>usageLimits, keyInvalid... Okay, I get it. I've seemingly hit the usage limits and they have invalidated API keys coming from this account. Except, I haven't...</p>
  
  <p>The "Courtesy Limit" is supposed to be "10,000 requests/day", yet I've only made a couple hundred calls (according to Google's own usage graphs), and I am still seeing "0% used" on the quotas tab.</p>
  
  <p>I would have brought this to Google directly, but they seem to have dropped their Developers Google Group in favor of a Google+ discussion that doesn't actually receive any responses.</p>
  
  <p>Any help or guidance is extremely appreciated. Thanks!</p>