<?php

$data = [
    'resellerID' => 'reseller', // obtained from https://manage.synergywholesale.com/home/resellers/api
    'apiKey' => 'api_key', // obtained from https://manage.synergywholesale.com/home/resellers/api
    'domainName' => 'testing-domain-registration-001.com',
    'years' => 1, // 1 to 10, depending on TLD,
    'command' => 'create' // create, renew or transfer are valid
];

$client = new SOAPClient(null, [
    'location' => 'https://api.synergywholesale.com/server.php',
    'uri' => '',
]);

$response = $client->checkDomain($data);