RestHandler::getIframePayParams

private function getIframePayParams(Payment $payment): array
{
	$params = [];

	$formSettings = $this->getHandlerSettings()['IFRAME_DATA'];
	if (isset($formSettings['FIELDS']))
	{
		$params = $this->getQueryDataFromFields($payment, $formSettings['FIELDS']);
	}

	return array_merge($params, $this->getSystemParams($payment));
}