curl --request GET \
  --url https://api.hubapi.com/automation/2026-09-beta/action-types \
  --header 'Authorization: Bearer <token>'

{
  "results": [
    {
      "actionName": "<string>",
      "actionTypeId": "<string>",
      "groupId": "<string>",
      "inputFieldDefinitions": [
        {
          "fieldDefinitionType": "SIMPLE",
          "isRequired": true,
          "name": "<string>",
          "type": "bool",
          "description": "<string>",
          "label": "<string>"
        }
      ],
      "objectTypeIds": [
        "<string>"
      ]
    }
  ]
}