[[_service_rpt_overview]]
= Requesting Party Token

A requesting party token (RPT) is a https://tools.ietf.org/html/rfc7519[JSON web token (JWT)] digitally signed using https://www.rfc-editor.org/rfc/rfc7515.txt[JSON web signature (JWS)]. The token is built based on the OAuth2 access token previously issued by {project_name} to a specific client acting on behalf of a user
or on its own behalf.

When you decode an RPT, you see a payload similar to the following:

```json
{
  "authorization": {
      "permissions": [
        {
          "resource_set_id": "d2fe9843-6462-4bfc-baba-b5787bb6e0e7",
          "resource_set_name": "Hello World Resource"
        }
      ]
  },
  "jti": "d6109a09-78fd-4998-bf89-95730dfd0892-1464906679405",
  "exp": 1464906971,
  "nbf": 0,
  "iat": 1464906671,
  "sub": "f1888f4d-5172-4359-be0c-af338505d86c",
  "typ": "kc_ett",
  "azp": "hello-world-authz-service"
}
```

From this token you can obtain all permissions granted by the server from the *permissions* claim.

Also note that permissions are directly related with the resources/scopes you are protecting and complete decoupled from
the access control methods that were used to actually grant and issue these same permissions.