curl --request POST \
  --url https://v1.api.flux-os.com/contracts/{id}/schedules/{schedule_id}/transport-chains/{transport_chain_id}/transport-legs \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --header 'x-user-id: <api-key>' \
  --data '
{
  "mode": "<unknown>",
  "source_land_description": "<unknown>",
  "destination_commercial_facility": "<unknown>",
  "volume": 123,
  "volume_measurement_unit": "<unknown>",
  "custodian_organization": "<unknown>",
  "position": 123,
  "source_well": null,
  "source_commercial_facility": null,
  "source_facility": null,
  "destination_facility": null,
  "custodian_entity": null,
  "is_custody_transfer": false,
  "fob": false,
  "carrier_organization": null,
  "carrier_entity": null,
  "carrier_user": null
}
'

{}