public function doBankTransfer(array $array) 
    {
        $this->formatRequest($array);
        $WSRequest = array(
            'payment'       => $this->payment($array['payment']),
            'creditor'      => $this->creditor($array['creditor']),
            'comment'       => $array['comment'],
            'transactionID' => $array['transactionID'],
            'orderID'       => $array['orderID']
        );
        return $this->webServiceRequest($array, $WSRequest, self::DIRECT_API, 'doBankTransfer');
    }