code: @Override
  	public Response updateEmailConfig(String CorpNum, String EmailType, Boolean SendYN) throws PopbillException {
  		return updateEmailConfig(CorpNum, EmailType, SendYN, null);
  	}
docs: /*
  (non-Javadoc)
  @see com.popbill.api.StatementService#updateEmailConfig(java.lang.String, java.lang.String, java.lang.Boolean)