@EventuateCommandHandler(subscriberId="customerCommandDispatcher", channel="customerService")
  public ReserveCreditResult reserveCredit(CommandMessage<ReserveCreditCommand> cm) {
    ReserveCreditCommand cmd = cm.getCommand();
    try {
      customerService.reserveCredit(cmd.customerId(), cmd.orderId(), cmd.orderTotal());
      return new CustomerCreditReserved();
    } catch (CustomerNotFoundException e) {
      return new CustomerNotFound();
    } catch (CustomerCreditLimitExceededException e) {
      return new CustomerCreditLimitExceeded();
    }
  }