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

{
  "data": [
    {
      "step_id": "<string>",
      "step_name": "<string>",
      "pv": 123,
      "uu": 123,
      "registration_count": 123,
      "registration_rate": 123,
      "sale_count": 123,
      "purchase_rate": 123,
      "sale_amount": 123,
      "pages": [
        {
          "page_id": "<string>",
          "page_name": "<string>",
          "pv": 123,
          "uu": 123,
          "registration_count": 123,
          "registration_rate": 123,
          "sale_count": 123,
          "purchase_rate": 123,
          "sale_amount": 123
        }
      ]
    }
  ]
}