curl --request POST \
  --url https://api.hubapi.com/crm/extensions/cards-dev/2026-03/{appId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "actions": {
    "baseUrls": [
      "<string>"
    ]
  },
  "display": {
    "properties": [
      {
        "dataType": "BOOLEAN",
        "label": "<string>",
        "name": "<string>",
        "options": [
          {
            "label": "<string>",
            "name": "<string>",
            "type": "DANGER"
          }
        ]
      }
    ]
  },
  "fetch": {
    "cardType": "EXTERNAL",
    "objectTypes": [
      {
        "name": "companies",
        "propertiesToSend": [
          "<string>"
        ]
      }
    ],
    "targetUrl": "<string>",
    "serverlessFunction": "<string>"
  },
  "title": "<string>"
}
'

{
  "actions": {
    "baseUrls": [
      "<string>"
    ]
  },
  "auditHistory": [
    {
      "actionType": "CREATE",
      "applicationId": 123,
      "authSource": "APP",
      "changedAt": 123,
      "initiatingUserId": 123,
      "objectTypeId": 123
    }
  ],
  "display": {
    "properties": [
      {
        "dataType": "BOOLEAN",
        "label": "<string>",
        "name": "<string>",
        "options": [
          {
            "label": "<string>",
            "name": "<string>",
            "type": "DANGER"
          }
        ]
      }
    ]
  },
  "fetch": {
    "objectTypes": [
      {
        "name": "companies",
        "propertiesToSend": [
          "<string>"
        ]
      }
    ],
    "targetUrl": "<string>"
  },
  "id": "<string>",
  "title": "<string>",
  "createdAt": "2023-11-07T05:31:56Z",
  "updatedAt": "2023-11-07T05:31:56Z"
}