Mensagem de Lista

<?php

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://{BACKEND_URL}/api/messages/sendList',
  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": "5547999444499",
  "body": "Selecione a melhor opção:",
  "optionList": {
    "buttonLabel": "Abrir lista de opções",
    "options": [
      {
        "id": "1",
        "description": "Multiatendimento",
        "title": "Whamax"
      },
      {
        "id": "2",
        "description": "Contratar",
        "title": "Planos"
      }
    ]
  }
}',
  CURLOPT_HTTPHEADER => array(
    'Content-Type: application/json',
    'Authorization: Bearer seutokenaqui' //Token cadastrado na conexão
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;