OpenCart 🇺🇦

$url_params = $this->getCommonParameters();
$url_params['Action'] = 'CompletePurchaseContract';
$url_params['PurchaseContractId'] = $parameters['contract_id'];
$url_params['IntegratorId'] = 'WelfordMedia';
$url_params['IntegratorName'] = 'WelfordMedia V2.0';

$response = $this->getResponse('GET', $url_params);

$order_ids = array();

$xml = simplexml_load_string($response);

if (isset($xml->CompletePurchaseContractResult->OrderIds->OrderId)) {
	foreach ($xml->CompletePurchaseContractResult->OrderIds->OrderId as $amazon_order_id) {
		$order_ids[] = (string)$amazon_order_id;
	}
}

return $order_ids;