keystone/api-ref/source/v3/samples/admin/auth-token-scoped-request.json

{
    "auth": {
        "identity": {
            "methods": [
                "token"
            ],
            "token": {
                "id": "'$OS_TOKEN'"
            }
        },
        "scope": {
            "project": {
                "id": "5b50efd009b540559104ee3c03bbb2b7"
            }
        }
    }
}