Enviar imágenes, documentos y audios por la API de WhatsApp

curl -X POST https://api.kontacto.pro/send-media \
  -H "Content-Type: application/json" \
  -d '{
    "api_key": "TU_API_KEY",
    "sender": "51999888777",
    "number": "51987654321",
    "media_type": "pdf",
    "caption": "Factura F001-2045.pdf",
    "url": "https://tusistema.com/facturas/F001-2045.pdf"
  }'

<?php
$datos = [
    'api_key' => 'TU_API_KEY',
    'sender' => '51999888777',
    'number' => '51987654321',
    'media_type' => 'pdf',
    'caption' => 'Factura F001-2045.pdf',
    'url' => 'https://tusistema.com/facturas/F001-2045.pdf',
];

$ch = curl_init('https://api.kontacto.pro/send-media');
curl_setopt_array($ch, [
    CURLOPT_POST           => true,
    CURLOPT_HTTPHEADER     => ['Content-Type: application/json'],
    CURLOPT_POSTFIELDS     => json_encode($datos),
    CURLOPT_RETURNTRANSFER => true,
]);
$respuesta = json_decode(curl_exec($ch), true);

const datos = {
  api_key: 'TU_API_KEY',
  sender: '51999888777',
  number: '51987654321',
  media_type: 'pdf',
  caption: 'Factura F001-2045.pdf',
  url: 'https://tusistema.com/facturas/F001-2045.pdf',
};

const respuesta = await fetch('https://api.kontacto.pro/send-media', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify(datos),
});
console.log(await respuesta.json());

import requests

datos = {
    "api_key": "TU_API_KEY",
    "sender": "51999888777",
    "number": "51987654321",
    "media_type": "pdf",
    "caption": "Factura F001-2045.pdf",
    "url": "https://tusistema.com/facturas/F001-2045.pdf",
}

respuesta = requests.post("https://api.kontacto.pro/send-media", json=datos, timeout=30)
print(respuesta.json())