curl --request GET \
  --url https://api.hubapi.com/extensions/sales-objects/v1/object-types/{objectTypeId}

{
  "id": 123,
  "applicationId": 123,
  "baseUris": [
    "<string>"
  ],
  "dataFetchUri": "<string>",
  "title": "<string>",
  "propertyDefinitions": [
    {}
  ],
  "associatedHubSpotObjectTypes": [
    "<string>"
  ],
  "associatedHubSpotObjectTypeProperties": {}
}