curl --request GET \
  --url https://agents.assemblyai.com/v1/webhook-subscriptions \
  --header 'Authorization: <api-key>'

{
  "subscriptions": [
    {
      "id": "<string>",
      "agent_id": "<string>",
      "url": "<string>",
      "events": [],
      "enabled": true,
      "secret_version": 1,
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z"
    }
  ],
  "has_more": true,
  "response_metadata": {
    "next_cursor": "<string>"
  }
}