public async Task LabelOrder()

in src/Web/Controllers/OrderController.cs [140:218]
71 lines of code
11 McCabe index (conditional complexity)

        public async Task<IActionResult> LabelOrder(
            OrderViewModel viewModel,
            LabelSource labelSource,
            LabelObjectType labelObjectType,
            LabelState labelStatus,
            LabelReasonCodes labelReasonCode,
            string effectiveStartDate,
            string effectiveEndDate)
        {
            var order = await GetOrder(viewModel.OrderNumber);
            if (order == null)
            {
                return BadRequest("No such order found for this user.");
            }

            #region Fraud Protection Service
            string labelObjectId;
            switch (labelObjectType)
            {
                case LabelObjectType.Purchase:
                    labelObjectId = order.RiskPurchase.PurchaseId;
                    break;
                case LabelObjectType.Account:
                    labelObjectId = order.RiskPurchase.User.UserId;
                    break;
                case LabelObjectType.Email:
                    labelObjectId = order.RiskPurchase.User.Email;
                    break;
                case LabelObjectType.PI:
                    labelObjectId = order.RiskPurchase.PaymentInstrumentList[0].MerchantPaymentInstrumentId;
                    break;
                default:
                    throw new InvalidOperationException("Label object type not supported: " + labelObjectType);
            }

            var label = new Label
            {
                LabelObjectType = labelObjectType.ToString(),
                LabelObjectId = labelObjectId,
                LabelSource = labelSource.ToString(),
                LabelReasonCodes = labelReasonCode.ToString(),
                LabelState = labelStatus.ToString(),
                EventTimeStamp = DateTimeOffset.Now,
                Processor = "Fraud Protection sample site",
            };

            if(!String.IsNullOrEmpty(effectiveStartDate) )
            {
                DateTimeOffset labelEffectiveStartDate;
                if (DateTimeOffset.TryParse(effectiveStartDate, out labelEffectiveStartDate))
                    {
                    label.EffectiveStartDate = labelEffectiveStartDate;
                }
            }

            if (!String.IsNullOrEmpty(effectiveEndDate))
            {
                DateTimeOffset labelEffectiveEndDate;
                if (DateTimeOffset.TryParse(effectiveEndDate, out labelEffectiveEndDate))
                    {
                    label.EffectiveEndDate = labelEffectiveEndDate;
                }
            }

            if (labelObjectType == LabelObjectType.Purchase)
            {
                label.Amount = order.Total;
                label.Currency = order.RiskPurchase?.Currency;
            }

            var correlationId = _fraudProtectionService.NewCorrelationId;
            var response = await _fraudProtectionService.PostLabel(label, correlationId);

            var fraudProtectionIO = new FraudProtectionIOModel(correlationId, label, response, "Label");
            TempData.Put(FraudProtectionIOModel.TempDataKey, fraudProtectionIO);
            #endregion

            return View("LabelDone");
        }