code: public InvoiceData getInvoice(Date date, String pricingAccountAlias) {
          Calendar calendar = Calendar.getInstance();
          calendar.setTime(date);
  
          return getInvoice(calendar, pricingAccountAlias);
      }
docs: Gets a list of invoicing data for a given account alias for a given month.
  @param date Date of usage
  @param pricingAccountAlias Short code of the account that sends the invoice for the accountAlias
  @return the invoice data