curl --request POST \
  --url https://external.emissions.bnzgreen.io/api/calculate \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <x-api-key>' \
  --header 'x-body-signature: <x-body-signature>' \
  --header 'x-platform-id: <x-platform-id>' \
  --data '
{
  "flights": [
    {
      "origin": "<string>",
      "destination": "<string>",
      "operatingCarrierCode": "<string>",
      "flightNumber": 123,
      "departureDate": {
        "year": 123,
        "month": 123,
        "day": 123
      }
    }
  ]
}
'

[
  {
    "flight": {
      "origin": "<string>",
      "destination": "<string>",
      "operatingCarrierCode": "<string>",
      "flightNumber": 123,
      "departureDate": {
        "year": 123,
        "month": 123,
        "day": 123
      }
    },
    "emissionsGramsPerPax": {
      "first": 123,
      "business": 123,
      "premiumEconomy": 123,
      "economy": 123
    }
  }
]