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

{
    "auth": {
        "identity": {
            "methods": [
                "password"
            ],
            "password": {
                "user": {
                    "id": "ee4dfb6e5540447cb3741905149d9b6e",
                    "password": "devstacker"
                }
            }
        },
        "scope": {
            "project": {
                "id": "a6944d763bf64ee6a275f1263fae0352"
            }
        }
    }
}