protected function GetMontradaRequstHash($aInput)
    {
        $sDelimiter = '-';

        $sString = $this->GetConfigParameter('secret').$sDelimiter;
        $sString .= $this->GetConfigParameter('merchid').$sDelimiter;
        $sString .= $aInput['orderid'].$sDelimiter;
        $sString .= $this->GetConfigParameter('payments').$sDelimiter;
        $sString .= $aInput['amount'].$sDelimiter;
        $sString .= $aInput['currency'].$sDelimiter;
        $sString .= $aInput['command'].$sDelimiter;
        $sString .= $aInput['timestamp'];

        return hash('sha256', $sString);
    }