I'm taking the Firebase Authentication service for a trial run. And having some initial Qs: 

* Howto use the [accountChooser](https://github.com/firebase/firebaseui-web#using-firebaseui-for-authentication) ?
* Howto enable Twitter & Github access ? ie, it's not clear to me, where we get the
	1. API key
	2. API secret
	3. Callback URL for Twitter or for an example?
* From where do I get the correct `apiKey` and `authDomain`?

*fig.1*

```
var config = {
  apiKey: “<key-from-google-console>”, 
  authDomain: "<my-app>.firebaseapp.com" 
};

firebase.initializeApp(config);

```

I got my current values from the Google API Manager Creds Dashboard. But when I press the `Sign in with Google` button, I get the error: 

*fig.2* (on firebase-ui-auth.js:206)

```
Internal error: 
{
  "error": {
    "errors": [
      {
        "domain": "global",
        "reason": "invalid",
        "message": "CONFIGURATION_NOT_FOUND"
      }
    ],
    "code": 400,
    "message": "CONFIGURATION_NOT_FOUND"
  }
}

```