# Authorization Grant Finder

The authorization grant finder provides API that allows users to use access tokens to retrieve their corresponding
authorization information. The access tokens can be requested via [Resource Owner GPII key
Grant](https://wiki.gpii.net/w/GPII_OAuth_2_Guide#Resource_Owner_GPII_Key_Grant).

## getGrantForAccessToken(accessToken)

* **description**: Retrieve the authorization information of an access token.
* **parameters:**
  * accessToken: String. A string representing an authorization issued to the client.
* **return:** A promise object. Once resolved, this object contains the authorization information for the access token.
  Return `undefined` when the access token is not found.
  * An example of the returned object:

```JSON
{
    "accessToken": "the_input_accessToken",
    "gpiiKey": "bob_gpii_key",
    "allowSettingsGet": true,
    "allowSettingsPut": true,
    "allowedPrefsToWrite": [
        "http://registry.gpii.net/common/language",
        "http://registry.gpii.net/common/DPIScale",
        "http://registry.gpii.net/common/highContrast/enabled",
        "http://registry.gpii.net/common/selfVoicing/enabled",
        "http://registry.gpii.net/applications/com.microsoft.windows.mouseSettings"
    ]
}
```