curl --request POST \
  --url https://api.utage-system.com/v1/accounts/{account_id}/scenarios/{scenario_id}/readers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "opt_in_confirmed": true,
  "scenario_fields": {},
  "common_fields": {},
  "has_step_immediately": true,
  "has_step_scheduled": true,
  "has_reminder": true,
  "allow_duplicates": true
}
'

{
  "data": {
    "id": "<string>",
    "common_reader_id": "<string>",
    "scenario_id": "<string>",
    "ip": "<string>",
    "line_display_name": "<string>",
    "line_picture_url": "<string>",
    "line_friend_id": "<string>",
    "base_date": "<string>",
    "is_blocked": true,
    "is_line_blocked": true,
    "is_mail_error": true,
    "is_sms_blocked": true,
    "block_datetime": "<string>",
    "partner": {
      "project_name": "<string>",
      "name": "<string>",
      "reward": 123
    },
    "has_step_scheduled": true,
    "has_reminder": true,
    "message_tracking_id": "<string>",
    "message_tracking_name": "<string>",
    "funnel_tracking_id": "<string>",
    "funnel_tracking_name": "<string>",
    "referrer": "<string>",
    "labels": [
      {
        "id": "<string>",
        "name": "<string>",
        "assigned_at": "<string>"
      }
    ],
    "scenario_fields": {},
    "common_fields": {},
    "memo": "<string>",
    "created_at": "<string>"
  }
}