But `id` does not come in as a parameter as far as I can see (http://developers.facebook.com/docs/reference/api/using-pictures/) - this is very similar to this where we have an `id` in the path but it is not listed in the `params`:

```json
{
    "path": ":id",
    "methods": [ "get" ],
    "params": {
        "fields": "optional",
        "access_token": "required"
    }
}
```

Am I missing something?