curl --request POST \
  --url https://tudominio.com/webhooks/on-conversation-closed-hubspot \
  --header 'Content-Type: application/json' \
  --data '{
  "external_id": "d2fa98d29a2670dfa119335df1b0371720d674f1677302aba228876a",
  "closed_at": "2019-01-01 00:00:00",
  "company_id": 252,
  "hubspot_deal_id": 1234,
  "hubspot_contact_id": 4567,
  "messages": [
    {
      "sender": "Juan",
      "message": "Hola, ¿cómo están?",
      "created_at": "2019-01-01 00:00:00"
    },
    {
      "sender": "Treble - Acme",
      "message": "Bienvenido a nuestro servicio",
      "created_at": "2019-01-01 00:00:10",
      "file_type": "IMAGE",
      "extra": "https://example.com/welcome.jpg"
    }
  ],
  "hsm": {
    "text": "Bienvenido a nuestro servicio de atención al cliente",
    "name": "welcome_message"
  },
  "user_session_keys": [
    {
      "key": "name",
      "value": "Juan",
      "type": null
    },
    {
      "key": "user_id",
      "value": "12345",
      "type": null
    }
  ]
}'

{}