return StringUtils.rightPad(student.getNumber().toString(), STUDENT_NUMBER_LENGTH, CODE_FILLER)
return StringUtils.leftPad(student.getNumber().toString(), STUDENT_NUMBER_LENGTH, CODE_FILLER)
    private static String getCodePrefix(final PaymentCodeType paymentCodeType, final Student student) {	return StringUtils.rightPad(student.getNumber().toString(), STUDENT_NUMBER_LENGTH, CODE_FILLER)		+ paymentCodeType.getTypeDigit();    }