Android - Google Server Side InApp Purchases verification Backend Error 500

问题

During the integration of G+ account I have turned off Google Play Android Developer API in Google Developer console by mistake. Google server started to return error:

Access Not Configured. Please use Google Developers Console to activate the API for your project

So I again turned Google Play Android Developer API on, but Google server still returns

error:
{
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "backendError",
    "message": "Backend Error"
   }
  ],
  "code": 500,
  "message": "Backend Error"
 }
}

Request I'm using looks like: https://www.googleapis.com/androidpublisher/v1.1/applications/... Everything before i turn off that switch was working correctly.

really appreciate any help / hint / idea.

来源：https://stackoverflow.com/questions/22462051/android-google-server-side-inapp-purchases-verification-backend-error-500