protected function generateFreeSpace()
    {
        $result = $this->formatAgencyAccount()
            . $this->formatOurNumber()
            . $this->title->assignment->wallet->operation
            . '000';
        return $result;
    }
protected function generateFreeSpace()
    {
        $result = $this->formatAgencyAccount()
            . $this->formatOurNumber()
            . $this->title->assignment->wallet->operation
            . '000';
        return $result;
    }
protected function generateFreeSpace ( ) { $ result = $ this -> formatAgencyAccount ( ) . $ this -> formatOurNumber ( ) . $ this -> title -> assignment -> wallet -> operation . '000' ; return $ result ; }
Free space, defined by Bank.

Here: Agency/Assignor . Our number . Wallet operation . '000'
Free space defined by Bank .