GooglePlusApiErrors.md

When no API key is configured

{
   "code":400,
   "errors":[
      {
         "domain":"usageLimits",
         "message":"Bad Request",
         "reason":"keyInvalid"
      }
   ],
   "message":"Bad Request"
}

when G+ service is not enabled.

{
   "code":403,
   "errors":[
      {
         "domain":"usageLimits",
         "message":"Access Not Configured",
         "reason":"accessNotConfigured"
      }
   ],
   "message":"Access Not Configured"
}