<?php
$apiKey = 'SUA_CHAVE_API';
$payload = [
  'cliente_nome' => 'Cliente Teste',
  'documento_nome' => 'contrato.pdf',
  'arquivo_base64' => 'JVBERi0xLjQ...',
  'canais' => ['WHATSAPP', 'EMAIL'],
  'whatsapp' => '5585997393939',
  'email' => 'cliente@email.com',
  'exigir_otp' => true,
];

$ch = curl_init('https://api.validoc.app.br/v1/documentos/enviar');
curl_setopt_array($ch, [
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_POST => true,
  CURLOPT_HTTPHEADER => [
    'Content-Type: application/json',
    'X-API-Key: ' . $apiKey,
  ],
  CURLOPT_POSTFIELDS => json_encode($payload),
]);

echo curl_exec($ch);
curl_close($ch);