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SoapClient.php

<?php
// Source: https://www.php.net/manual/en/class.soapclient.php#102503

class exampleChannelAdvisorAuth {
	public $developerKey;
	public $password;

	public function __construct($key, $pass) {
		$this->developerKey = $key;
		$this->password = $pass;
	}
}

$devKey = '';
$password = '';
$accountId = '';

$url = '';
$client = new SoapClient($url, ['trace' => 1, 'exception' => 0]);

$auth = new ChannelAdvisorAuth($devKey, $password);
$header = new SoapHeader('http://www.example.com/webservices/', 'APICredentials', $auth, $false);

$result = $client->__soapCall('DeleteMarketplaceAd', [
	'DeleteMarketplaceAd' => [
		'accountID' => $accountId,
		'marketplaceAdID' => '9938745',
	]
], null, $header);

echo '<pre>';
var_dump($result);
echo '</pre>';

if($result->DeleteMarketplaceAdResult->Status == 'Success') {
	echo 'Item deleted!';
}