public boolean expireTicket(final String ticketStr) {
    try {
      final PaymentRequestTicket ticket =
          (PaymentRequestTicket)
              ticketService.load(ticketStr, PaymentRequestTicket.Relationships.FROM_CHANNEL);
      // Check the member restriction
      final Member restricted = WebServiceContext.getMember();
      if (restricted != null && !restricted.equals(ticket.getTo())) {
        throw new Exception();
      }

      // Check the from channel
      final Channel resolvedChannel = WebServiceContext.getChannel();
      final Channel fromChannel = ticket.getFromChannel();
      final Channel toChannel = ticket.getToChannel();
      if ((fromChannel == null || !fromChannel.equals(resolvedChannel))
          && (toChannel == null || !toChannel.equals(resolvedChannel))) {
        throw new Exception();
      }

      // Check by status
      if (ticket.getStatus() == Ticket.Status.PENDING) {
        ticketService.expirePaymentRequestTicket(ticket);
        return true;
      }
    } catch (final Exception e) {
      webServiceHelper.error(e);
      // Ignore exceptions
    }
    return false;
  }
  public PaymentResult confirmPayment(final ConfirmPaymentParameters params) {
    Exception errorException = null;
    AccountStatus fromMemberStatus = null;
    AccountStatus toMemberStatus = null;
    Member fromMember = null;
    Member toMember = null;

    // It's nonsense to use this if restricted to a member
    if (WebServiceContext.getMember() != null) {
      throw new PermissionDeniedException();
    }
    final Channel channel = WebServiceContext.getChannel();
    final String channelName = channel == null ? null : channel.getInternalName();

    PaymentStatus status = null;
    AccountHistoryTransferVO transferVO = null;

    // Get the ticket
    PaymentRequestTicket ticket = null;
    try {
      // Check that the ticket is valid
      final Ticket t = ticketService.load(params.getTicket());
      fromMember = t.getFrom();
      toMember = t.getTo();

      if (!(t instanceof PaymentRequestTicket) || t.getStatus() != Ticket.Status.PENDING) {
        throw new Exception(
            "Invalid ticket and/or status: "
                + t.getClass().getName()
                + ", status: "
                + t.getStatus());
      }
      // Check that the channel is the expected one
      ticket = (PaymentRequestTicket) t;
      if (!ticket.getToChannel().getInternalName().equals(channelName)) {
        throw new Exception(
            "The ticket's destination channel is not the expected one (expected="
                + channelName
                + "): "
                + ticket.getToChannel().getInternalName());
      }
    } catch (final Exception e) {
      errorException = e;
      status = PaymentStatus.INVALID_PARAMETERS;
    }

    // Validate the Channel and credentials
    Member member = null;
    if (status == null) {
      member = ticket.getFrom();
      if (!accessService.isChannelEnabledForMember(channelName, member)) {
        status = PaymentStatus.INVALID_CHANNEL;
      }
      if (status == null && WebServiceContext.getClient().isCredentialsRequired()) {
        try {
          checkCredentials(member, channel, params.getCredentials());
        } catch (final InvalidCredentialsException e) {
          status = PaymentStatus.INVALID_CREDENTIALS;
        } catch (final BlockedCredentialsException e) {
          status = PaymentStatus.BLOCKED_CREDENTIALS;
        }
      }
    }
    // Confirm the payment
    if (status == null) {
      try {
        final Transfer transfer = (Transfer) paymentService.confirmPayment(ticket.getTicket());
        transferVO = accountHelper.toVO(member, transfer, null);
        status = paymentHelper.toStatus(transfer);

        if (WebServiceContext.getClient()
            .getPermissions()
            .contains(ServiceOperation.ACCOUNT_DETAILS)) {
          if (WebServiceContext.getMember() == null) {
            fromMemberStatus =
                accountService.getStatus(
                    new GetTransactionsDTO(fromMember, transfer.getFrom().getType()));
            toMemberStatus =
                accountService.getStatus(
                    new GetTransactionsDTO(toMember, transfer.getTo().getType()));
          } else if (WebServiceContext.getMember().equals(fromMember)) {
            fromMemberStatus =
                accountService.getStatus(
                    new GetTransactionsDTO(fromMember, transfer.getFrom().getType()));
          } else {
            toMemberStatus =
                accountService.getStatus(
                    new GetTransactionsDTO(toMember, transfer.getTo().getType()));
          }
        }
      } catch (final Exception e) {
        errorException = e;
        status = paymentHelper.toStatus(e);
      }
    }

    if (!status.isSuccessful()) {
      webServiceHelper.error(
          errorException != null
              ? errorException
              : new Exception("Confirm payment status: " + status));
    }
    // Build the result
    return new PaymentResult(
        status,
        transferVO,
        accountHelper.toVO(fromMemberStatus),
        accountHelper.toVO(toMemberStatus));
  }