curl --request GET \
  --url https://api.hubapi.com/crm/v3/extensions/cards-dev/{appId} \
  --header 'Authorization: Bearer <token>'

{
  "results": [
    {
      "actions": {
        "baseUrls": [
          "https://www.example.com/hubspot"
        ]
      },
      "auditHistory": [
        {
          "applicationId": 123,
          "changedAt": 123,
          "initiatingUserId": 123,
          "objectTypeId": 123
        }
      ],
      "display": {
        "properties": [
          {
            "label": "<string>",
            "name": "<string>",
            "options": [
              {
                "label": "<string>",
                "name": "<string>"
              }
            ]
          }
        ]
      },
      "fetch": {
        "objectTypes": [
          {
            "propertiesToSend": [
              "<string>"
            ]
          }
        ],
        "targetUrl": "<string>"
      },
      "id": "<string>",
      "title": "<string>",
      "createdAt": "2023-11-07T05:31:56Z",
      "updatedAt": "2023-11-07T05:31:56Z"
    }
  ]
}