# Authorize using an External Application and retrieve the available resources

> 1. Create a new Document Understanding<sup>TM</sup> project and retrieve the `projectId` (found within the project's URL).

1. Create a new Document Understanding<sup>TM</sup> project and retrieve the `projectId` (found within the project's URL).

   For this example we are using the predefined project<sup>*</sup> available in Swagger, identifiable with this `projectID`: **00000000-0000-0000-0000-000000000000.**

   :::note
   The predefined project is not visible in the Document Understanding UI. It provides programatic access to the available public ML models.
   :::
2. Create an External Application where Document Understanding is used as a **Resource** and it includes all the available **Application Scopes**.
3. Initiate a curl call to the Identity Service for obtaining a token.
```
curl --data \
-urlencode "scope=Du.Digitization"  --data \
-urlencode "client_id={app_id}" --data \
-urlencode "client_secret={app_secret}" --data \
-urlencode "grant_type=client_credentials" https://cloud.uipath.com/identity_/connect/token
```

:::note
The Authorization token has an expiration period. See the following response for the expiration and make sure to renew it before it expires.
:::

```
{
"access_token": "eyJh**CRaKrg",
"expires_in": 3600,
"token_type": "Bearer",
"scope": "Du.Digitization.Api"
}
```