Add a message to a conversation

curl --request POST \
  --url https://1-some-client.some-server.healvi-chat/third-party/v1/conversations/{conversationId}/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "type": "<string>",
  "reference_id": 123,
  "text": {
    "content": "<string>"
  },
  "image": {
    "caption": "<string>"
  },
  "video": {
    "caption": "<string>"
  },
  "audio": {
    "voice": true
  },
  "document": {
    "filename": "<string>",
    "caption": "<string>"
  },
  "location": {
    "latitude": "<string>",
    "longitude": "<string>",
    "remaining_fields": "See location schema."
  },
  "contact": {
    "name": {
      "formatted_name": "<string>"
    },
    "remaining_fields": "See contact schema."
  },
  "file": {
    "url": "<string>",
    "mime_type": "<string>",
    "size": 123,
    "internal_uuid": "<string>"
  }
}'

{
  "data": {
    "id": 123,
    "conversation_id": 123,
    "from": "system",
    "source": "user",
    "user_id": 123,
    "contents": [
      {
        "type": "text",
        "content": "<string>"
      }
    ],
    "status": "created",
    "agent_reaction": "<string>",
    "customer_reaction": "<string>",
    "sent_at": "2023-01-01T12:00:00Z",
    "reference": {},
    "latest_error": {
      "id": 123,
      "message_id": 123,
      "type": "status-update",
      "original_message": "<string>",
      "created_at": "2023-01-01T12:00:00Z"
    },
    "whatsapp_campaign": {
      "id": 123,
      "name": "<string>"
    }
  }
}