{
    "enabled": true,
    "required": false,
    "code_length": 6,
    "code_ttl_sec": 300,
    "max_attempts": 5,
    "resend_cooldown_sec": 60,
    "link_base_url": "https://example.com/verify-email",
    "rate_limit": {
        "per_email_per_hour": 5
    },
    "email_subject": "이메일 인증"
}