curl -X POST "https://api.oxenty.api.br/api/contacts/block" \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "sessionId": "550e8400-e29b-41d4-a716-446655440000",
    "jid": "5511999999999@s.whatsapp.net"
  }'

await client.contacts.block({
  sessionId: '550e8400-e29b-41d4-a716-446655440000',
  jid: '5511999999999@s.whatsapp.net',
});

{
  "success": true,
  "jid": "5511999999999@s.whatsapp.net",
  "action": "blocked"
}