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Authentication

Quick overview

If you're running in Compute Engine or App Engine, authentication should "just work".
If you're developing locally, the easiest way to authenticate is using the Google Cloud SDK:
```
$ gcloud auth login
```

If you're running your application elsewhere, you should download a service account JSON keyfile and point to it using an environment variable:
```
$ export GOOGLE_APPLICATION_CREDENTIALS="/path/to/keyfile.json"
```