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

{
  "actions": {
    "baseUrls": [
      "https://www.example.com/hubspot"
    ]
  },
  "createdAt": "2019-10-30T03:30:17.883Z",
  "display": {
    "properties": [
      {
        "dataType": "STRING",
        "label": "Pets Name",
        "name": "pet_name"
      }
    ]
  },
  "fetch": {
    "objectTypes": [
      {
        "name": "contacts",
        "propertiesToSend": [
          "email",
          "firstname"
        ]
      }
    ],
    "targetUrl": "https://www.example.com/hubspot/target"
  },
  "title": "PetSpot",
  "updatedAt": "2019-11-30T03:30:17.883Z"
}