curl --request POST \
  --url https://api.cargado.com/carrier-relationships/upsert \
  --header 'Content-Type: application/json' \
  --header 'api-key: <api-key>' \
  --data '
{
  "carrierRelationships": [
    {
      "carrier": {
        "dotNumber": "<string>",
        "mcNumber": "<string>",
        "mxNumber": "<string>",
        "rfcNumber": "<string>",
        "cvorNumber": "<string>",
        "nirNumber": "<string>",
        "nscNumber": "<string>",
        "externalId": "<string>"
      },
      "status": "ACTIVE",
      "onboardingStatus": "ONBOARDED",
      "carrierExternalId": "<string>"
    }
  ]
}
'

{
  "carrierRelationships": [
    {
      "id": "<string>",
      "organizationId": "<string>",
      "carrierOrganizationId": "<string>",
      "status": "ACTIVE",
      "onboardingStatus": "ONBOARDED",
      "source": "API",
      "carrierExternalId": "<string>"
    }
  ]
}