Steam OpenId¶

Steam OpenId works quite straightforward, but to retrieve some user data (known as player on Steam API) a Steam API Key is needed.

Configurable settings:

Supply a Steam API Key from Steam Dev:
```
SOCIAL_AUTH_STEAM_API_KEY = key
```
To save player data provided by Steam into extra_data:
```
SOCIAL_AUTH_STEAM_EXTRA_DATA = ['player']
```