curl --request GET \
  --url https://staging.api.commercengine.io/api/v1/{store_id}/storefront/auth/user/{id}/notification-preferences \
  --header 'Authorization: Bearer <token>'

{
  "message": "<string>",
  "success": true,
  "content": {
    "notification_preferences": {
      "transactional": {
        "email": true,
        "sms": true,
        "whatsapp": true
      },
      "promotional": {
        "email": true,
        "sms": true,
        "whatsapp": true
      },
      "newsletter": {
        "email": true,
        "sms": true,
        "whatsapp": true
      }
    }
  }
}