curl --request GET \
  --url https://api.hubapi.com/crm/v3/extensions/cards-dev/{appId}

{
  "results": [
    {
      "id": "123",
      "createdAt": "2020-02-26T18:30:53.451Z",
      "updatedAt": "2020-02-26T18:30:53.451Z",
      "title": "PetSpot",
      "fetch": {
        "targetUrl": "https://www.example.com/hubspot/target",
        "objectTypes": [
          {
            "name": "contacts",
            "propertiesToSend": [
              "email",
              "firstname"
            ]
          }
        ]
      },
      "display": {
        "properties": [
          {
            "name": "pet_name",
            "label": "Pets Name",
            "dataType": "STRING"
          }
        ]
      },
      "actions": {
        "baseUrls": [
          "https://www.example.com/hubspot"
        ]
      }
    }
  ]
}