union-php/vendor/volcengine/volc-sdk-php/examples/SecretNumber/DemoClick2CallLite.php

<?php
use Volc\Service\SecretNumber;

require('../../vendor/autoload.php');
require('../../src/Service/SecretNumber.php');

$client = SecretNumber::getInstance();
$client->setAccessKey("your ak");
$client->setSecretKey("your sk");

$body = [
    'Caller' => '137XXXX8257',
    'Callee' => '158XXXX9130',
    'NumberPoolNo' => 'NPXXXXX810901043',
];

$response = $client->Click2CallLite($body);
echo $response;