curl --request POST \
  --url https://apis.vectalk.com.br/api/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "messaging_product": "whatsapp",
    "to": "5511999999999",
    "type": "audio",
    "audio": { "link": "https://example.com/audio.ogg" }
  }'