curl -X POST "https://api.oxenty.api.br/api/contacts/check" \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "sessionId": "550e8400-e29b-41d4-a716-446655440000",
    "numbers": ["5511999999999", "5511888888888", "5511777777777"]
  }'

const results = await client.contacts.check(sessionId, {
  numbers: ['5511999999999', '5511888888888', '5511777777777'],
});

for (const result of results) {
  if (result.exists) {
    console.log(`${result.number} está no WhatsApp: ${result.jid}`);
  } else {
    console.log(`${result.number} não está no WhatsApp`);
  }
}

results = client.contacts.check(
    session_id,
    numbers=['5511999999999', '5511888888888', '5511777777777']
)

for result in results['results']:
    if result['exists']:
        print(f"{result['number']} está no WhatsApp: {result['jid']}")
    else:
        print(f"{result['number']} não está no WhatsApp")

{
  "success": true,
  "results": [
    {
      "number": "5511999999999",
      "exists": true,
      "jid": "5511999999999@s.whatsapp.net"
    },
    {
      "number": "5511888888888",
      "exists": true,
      "jid": "5511888888888@s.whatsapp.net"
    },
    {
      "number": "5511777777777",
      "exists": false,
      "jid": null
    }
  ]
}