curl --request GET \
  --url https://panel.sendcloud.sc/api/v2/insights/carriers/transit-times \
  --header 'Authorization: Basic <encoded-value>'

{
  "transit_times": [
    {
      "user_id": "1234",
      "carrier_code": "postnl",
      "from_country": "NL",
      "to_country": "DE",
      "start_date": "2022-12-31",
      "end_date": "2023-11-17",
      "total_parcels": 2406,
      "transit_time": 82
    },
    {
      "user_id": "1234",
      "carrier_code": "dhl",
      "from_country": "DE",
      "to_country": "AT",
      "start_date": "2021-12-31",
      "end_date": "2022-12-31",
      "total_parcels": 75422,
      "transit_time": 51
    }
  ]
}