curl --request GET \
  --url https://api.bland.ai/v1/postcall/webhooks/{call_id} \
  --header 'authorization: <authorization>'

{
  "data": {
    "payload": {},
    "url": "<string>",
    "created_at": "<string>",
    "call_id": "<string>",
    "user_id": "<string>",
    "metadata": [
      {
        "sent_at": "<string>",
        "response_code": 123,
        "response_time": "<string>",
        "send_type": "<string>"
      }
    ]
  },
  "errors": [
    {
      "error": "<string>",
      "message": "<string>"
    }
  ]
}