Enviar Carrossel

<?php

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://{BACKEND_URL}/api/messages/whatsmeow/sendCarousel',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_POSTFIELDS =>'{
  "number": "555192914354",
  "caption": "TESTE",
  "footer": "Testando",
  "openTicket": "0",
  "queueId": 0,
  "cards": [
    {
      "title": "Produto 1",
      "body": "Descrição do produto",
      "footer": "R$ 99,90",
      "imageUrl": "https://picsum.photos/400/400",
      "buttons": [
        {"id": "comprar_1", "text": "Comprar"},
        {"id": "info_1", "text": "Mais info"}
      ]
    },
    {
      "title": "Produto 2",
      "body": "Outro produto incrível",
      "footer": "R$ 149,90",
      "imageUrl": "https://picsum.photos/401/401",
      "buttons": [
        {"id": "comprar_2", "text": "Comprar"}
      ]
    }
  ]
}',
  CURLOPT_HTTPHEADER => array(
    'Content-Type: application/json',
    'Authorization: Bearer seutokenaqui' //Token cadastrado na conexão
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;