code: @Override
      public EmailPublicKey[] getEmailPublicKeys(String CorpNum)
              throws PopbillException {
  
          return httpget("/Taxinvoice/EmailPublicKeys", CorpNum, null,
                  EmailPublicKey[].class);
      }
docs: /* (non-Javadoc)
  @see com.popbill.api.TaxinvoiceService#getEmailPublicKeys(java.lang.String)