Chat ID integration - based on webhooks

<?php

// read the webhook sent by LiveChat
$data = file_get_contents('php://input');
$data = json_decode($data);

// make sure the "chat_started" event occured
if ($data->event_type === 'chat_started') {
    $chat_id = $data->chat->id;


    $fields = array();
    $fields[] = (object)array(
        'name' => 'Chat ID',
        'value' => $chat_id
    );
    $curlFields = http_build_query(array(
        'license_id' => $data->license_id,
        'token' => $data->token,
        'id' => 'chat-id-integration',
        'fields' => $fields
    ));
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'https://api.livechatinc.com/visitors/'.$data->visitor->id.'/details');
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $curlFields);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('X-API-Version: 2'));
    $result = curl_exec($ch);
    curl_close($ch);
}