/**
* Based on payment model generates signature
*
* @param Payment $payment
*
* @return string
*/
public static function generateSignature(Payment $payment)
{
$secretKey = $payment->getSecretKey();
$string = self::METHOD_NAME . $secretKey;
$string .= $payment->getPgwShopId() . $secretKey;
$string .= $payment->getPgwOrderId() . $secretKey;
$string .= $payment->getPgwAmount() . $secretKey;
$string .= $payment->getPgwAuthorizationType() . $secretKey;
$string .= $payment->getPgwAuthorizationToken() . $secretKey;
$string .= $payment->getPgwLanguage() . $secretKey;
$string .= $payment->getPgwReturnMethod() . $secretKey;
$string .= $payment->getPgwSuccessUrl() . $secretKey;
$string .= $payment->getPgwFailureUrl() . $secretKey;
$string .= $payment->getPgwFirstName() . $secretKey;
$string .= $payment->getPgwLastName() . $secretKey;
$string .= $payment->getPgwStreet() . $secretKey;
$string .= $payment->getPgwCity() . $secretKey;
$string .= $payment->getPgwPostCode() . $secretKey;
$string .= $payment->getPgwCountry() . $secretKey;
$string .= $payment->getPgwPhoneNumber() . $secretKey;
$string .= $payment->getPgwEmail() . $secretKey;
$string .= $payment->getPgwmerchantData() . $secretKey;
$string .= $payment->getPgwOrderInfo() . $secretKey;
$string .= $payment->getPgwOrderItems() . $secretKey;
$string .= $payment->getPgwDisableInstallments() . $secretKey;
return hash('sha512', $string);
}