/**
* Get invoice
*
* @param Varien_Object $payment
* @return array
*/
public function _getInvoice(Varien_Object $payment)
{
$payment->setShift4RequestType(self::REQUEST_TYPE_GET_INVOICE);
$request = $this->_buildRequest($payment);
$response = $this->_postRequest($request);
$this->_logGateway($request, $response);
return $response;
}
