code: public InvoiceData getInvoice(LocalDate date, String pricingAccountAlias) {
          return getInvoice(date.getYear(), date.getMonthValue(), 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