curl --request GET \
  --url https://api.utage-system.com/v1/funnels/{funnel_id}/subscribers \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "<string>",
      "step_name": "<string>",
      "page_title": "<string>",
      "mail": "<string>",
      "name": "<string>",
      "sei": "<string>",
      "mei": "<string>",
      "kana": "<string>",
      "phone": "<string>",
      "zipcode": "<string>",
      "pref": "<string>",
      "city": "<string>",
      "address": "<string>",
      "building": "<string>",
      "line_display_name": "<string>",
      "line_picture_url": "<string>",
      "tracking_name": "<string>",
      "utm_source": "<string>",
      "utm_medium": "<string>",
      "utm_campaign": "<string>",
      "utm_term": "<string>",
      "utm_content": "<string>",
      "reserved_datetime": "<string>",
      "created_at": "<string>"
    }
  ],
  "meta": {
    "current_page": 123,
    "per_page": 123,
    "total": 123
  }
}