code: public PaymillList<Transaction> list( Transaction.Filter filter, Transaction.Order order, Integer count, Integer offset ) {
      return RestfulUtils.list( TransactionService.PATH, filter, order, count, offset, Transaction.class, super.httpClient );
    }
docs: This function returns a {@link List} of PAYMILL {@link Transaction} objects. In which order this list is returned depends on
  the optional parameters. If <code>null</code> is given, no filter or order will be applied, overriding the default count and
  offset.
  @param filter
  {@link com.paymill.models.Transaction.Filter} or <code>null</code>
  @param order
  {@link com.paymill.models.Transaction.Order} or <code>null</code>
  @param count
  Max {@link Integer} of returned objects in the {@link PaymillList}
  @param offset
  {@link Integer} to start from.
  @return {@link PaymillList} which contains a {@link List} of PAYMILL {@link Transaction}s and their total count.