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": "document",
    "document": {
      "link": "https://example.com/relatorio.pdf",
      "filename": "relatorio.pdf",
      "caption": "Relatório mensal"
    }
  }'

{
  "messaging_product": "whatsapp",
  "contacts": [{ "input": "5511999999999", "wa_id": "5511999999999" }],
  "messages": [{ "id": "wamid.HBgLNTUxMTk5OTk5OTk5..." }]
}