keystone/api-ref/source/v3/samples/admin/user-create-request.json

{
    "user": {
        "default_project_id": "263fd9",
        "domain_id": "1789d1",
        "enabled": true,
        "name": "James Doe",
        "password": "secretsecret",
        "description": "James Doe user",
        "email": "jdoe@example.com",
        "options": {
            "ignore_password_expiry": true
        }
    }
}