curl --request POST \
  --url https://app.omnivibe.com.br/public/api/v1/inboxes/{inbox_identifier}/contacts/{contact_identifier}/conversations/{conversation_id}/messages \
  --header 'Content-Type: application/json' \
  --data '
{
  "content": "Hello, how can I help you?",
  "echo_id": "1234567890"
}
'

{
  "id": 123,
  "content": "<string>",
  "message_type": 123,
  "content_type": "<string>",
  "content_attributes": {},
  "created_at": 123,
  "conversation_id": 123,
  "attachments": [
    {
      "id": 123,
      "message_id": 123,
      "file_type": "image",
      "account_id": 123,
      "extension": "<string>",
      "data_url": "<string>",
      "thumb_url": "<string>",
      "file_size": 123,
      "width": 123,
      "height": 123,
      "coordinates_lat": 123,
      "coordinates_long": 123,
      "fallback_title": "<string>",
      "meta": {},
      "transcribed_text": "<string>"
    }
  ],
  "sender": {
    "id": 123,
    "name": "<string>",
    "avatar_url": "<string>",
    "thumbnail": "<string>",
    "type": "contact",
    "available_name": "<string>",
    "availability_status": "<string>",
    "email": "<string>",
    "phone_number": "<string>",
    "identifier": "<string>",
    "blocked": true,
    "additional_attributes": {},
    "custom_attributes": {},
    "description": "<string>",
    "created_at": "<string>"
  }
}