gistfile1.scala

  override def processPDT(r: Req)(): Box[LiftResponse] = {
    val ret = for (tx <- r.param("tx").or(Failure("parameter tx missing in PayPal PDT call"));
         val y = logger.debug("calling PaypalDataTransfer with paypayAuthToken: " + paypalAuthToken +
             ",tx: " + tx + ", mode: " + mode + ", connection: " + connection);
         val resp = PaypalDataTransfer(paypalAuthToken, tx, mode, connection);
         info <- resp.paypalInfo.or(Failure("Paypal Info not available. PaypalDataTransfer returned: " + 
             resp));
         redir <- tryo(pdtResponse(info, r))) yield {
      redir
    }