curl "https://app.talkover.ai/api/v1/callback-agents" \
  -H "Authorization: Bearer talq_your_environment_token_here"

{
  "success": true,
  "data": [
    {
      "id": "agent-uuid-1",
      "name": "Callback Handler",
      "label": "Inbound Callback Agent",
      "direction": "inbound",
      "current_status": "published",
      "callback_config": {
        "source_agent_ids": ["agent-uuid-2", "agent-uuid-3"]
      }
    }
  ]
}