Untitled

    public void inputValidationGenerateDeeplink(GenerateDeeplinkRequestV3 request) {
        List<DetailedErrorItem> detailedErrorItemList = new ArrayList<>();

        // 4.
        if (StringUtils.isEmpty(request.getBilledAmountType())) {
            request.setBilledAmountType("A1");
        } else {
            if (!PAYMENT_CHANNEL_BAY_CMS.equals(request.getPaymentChannel())) {
                detailedErrorItemList.add(
                        new DetailedErrorItem("Unsupported operation for the selected paymentChannel")
                );
            }
            if (!"A1".equals(request.getBilledAmountType()) && !ObjectUtils.isEmpty(request.getWithholdingTaxInformationItems())) {
                detailedErrorItemList.add(
                        new DetailedErrorItem("billedAmountType must not be sent or sent as A1 when withholdingTaxInformationItems is provided")
                );
            }
        }

        // 5.
        if (StringUtils.isEmpty(request.getExpiryDateTime())) {

        } else {
        }

        // 6.
        if (!ObjectUtils.isEmpty(request.getWithholdingTaxInformationItems()) && !PAYMENT_CHANNEL_BAY_CMS.equals(request.getPaymentChannel())) {
            if (ObjectUtils.isEmpty(request.getReportingInformation()) || StringUtils.isEmpty(request.getReportingInformation().getWithholdingTaxProcessingType())) {
                detailedErrorItemList.add(
                        new DetailedErrorItem("reportingInformation.withholdingTaxProcessingType must be provided when paymentChannel is not BAY_CMS and withholdingTaxInformationItems is provided")
                );
            } else {
                if ("WHT".equals(request.getReportingInformation().getWithholdingTaxProcessingType())
                        || "WHT_CERT".equals(request.getReportingInformation().getWithholdingTaxProcessingType())) {
                    if (StringUtils.isEmpty(request.getReportingInformation().getWithholdingTaxFormNumber())) {
                        detailedErrorItemList.add(
                                new DetailedErrorItem("reportingInformation.withholdingTaxFormNumber must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is WHT or WHT_CERT")
                        );
                    }
                    if ("WHT_CERT".equals(request.getReportingInformation().getWithholdingTaxProcessingType())) {
                        if (StringUtils.isEmpty(request.getReportingInformation().getPayerBranchCode())) {
                            detailedErrorItemList.add(
                                    new DetailedErrorItem("reportingInformation.payerBranchCode must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is WHT_CERT")
                            );
                        }
                        if (StringUtils.isEmpty(request.getReportingInformation().getPayeeIdentificationNumber())) {
                            detailedErrorItemList.add(
                                    new DetailedErrorItem("reportingInformation.payeeIdentificationNumber must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is WHT_CERT")
                            );
                        }
                        if (StringUtils.isEmpty(request.getReportingInformation().getPayeeTypeOfIdentification())) {
                            detailedErrorItemList.add(
                                    new DetailedErrorItem("reportingInformation.payeeTypeOfIdentification must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is WHT_CERT")
                            );
                        }
                        if (StringUtils.isEmpty(request.getReportingInformation().getPayeeBranchCode())) {
                            detailedErrorItemList.add(
                                    new DetailedErrorItem("reportingInformation.payeeBranchCode must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is WHT_CERT")
                            );
                        }
                        if (StringUtils.isEmpty(request.getReportingInformation().getPayerFirstName())) {
                            detailedErrorItemList.add(
                                    new DetailedErrorItem("reportingInformation.payerFirstName must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is WHT_CERT")
                            );
                        }
                        if (StringUtils.isEmpty(request.getReportingInformation().getPayerAddress())) {
                            detailedErrorItemList.add(
                                    new DetailedErrorItem("reportingInformation.payerAddress must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is WHT_CERT")
                            );
                        }
                        if (StringUtils.isEmpty(request.getReportingInformation().getPayeeFirstName())) {
                            detailedErrorItemList.add(
                                    new DetailedErrorItem("reportingInformation.payeeFirstName must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is WHT_CERT")
                            );
                        }
                        if (StringUtils.isEmpty(request.getReportingInformation().getPayeeAddress())) {
                            detailedErrorItemList.add(
                                    new DetailedErrorItem("reportingInformation.payeeAddress must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is WHT_CERT")
                            );
                        }
                    }
                } else if ("EWHT".equals(request.getReportingInformation().getWithholdingTaxProcessingType())
                        || "EWHT_CERT".equals(request.getReportingInformation().getWithholdingTaxProcessingType())) {
                    if (StringUtils.isEmpty(request.getReportingInformation().getPayerBranchCode())) {
                        detailedErrorItemList.add(
                                new DetailedErrorItem("reportingInformation.payerBranchCode must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is EWHT or EWHT_CERT")
                        );
                    }
                    if (StringUtils.isEmpty(request.getReportingInformation().getPayeeIdentificationNumber())) {
                        detailedErrorItemList.add(
                                new DetailedErrorItem("reportingInformation.payeeIdentificationNumber must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is EWHT or EWHT_CERT")
                        );
                    }
                    if (StringUtils.isEmpty(request.getReportingInformation().getPayeeTypeOfIdentification())) {
                        detailedErrorItemList.add(
                                new DetailedErrorItem("reportingInformation.payeeTypeOfIdentification must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is EWHT or EWHT_CERT")
                        );
                    }
                    if (StringUtils.isEmpty(request.getReportingInformation().getPayeeBranchCode())) {
                        detailedErrorItemList.add(
                                new DetailedErrorItem("reportingInformation.payeeBranchCode must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is EWHT or EWHT_CERT")
                        );
                    }
                    if ("EWHT_CERT".equals(request.getReportingInformation().getWithholdingTaxProcessingType())) {
                        if (StringUtils.isEmpty(request.getReportingInformation().getPayerFirstName())) {
                            detailedErrorItemList.add(
                                    new DetailedErrorItem("reportingInformation.payerFirstName must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is EWHT_CERT")
                            );
                        }
                        if (StringUtils.isEmpty(request.getReportingInformation().getPayerAddress())) {
                            detailedErrorItemList.add(
                                    new DetailedErrorItem("reportingInformation.payerAddress must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is EWHT_CERT")
                            );
                        }
                        if (StringUtils.isEmpty(request.getReportingInformation().getPayeeFirstName())) {
                            detailedErrorItemList.add(
                                    new DetailedErrorItem("reportingInformation.payeeFirstName must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is EWHT_CERT")
                            );
                        }
                        if (StringUtils.isEmpty(request.getReportingInformation().getPayeeAddress())) {
                            detailedErrorItemList.add(
                                    new DetailedErrorItem("reportingInformation.payeeAddress must be provided when paymentChannel is not BAY_CMS and reportingInformation.withholdingTaxProcessingType is EWHT_CERT")
                            );
                        }
                    }
                }
            }
        }

        // 7.
        if (request.getSmartFinancialPaymentIndicator() == null) {
            request.setSmartFinancialPaymentIndicator(false);
        } else if (request.getSmartFinancialPaymentIndicator()) {
            if (!PAYMENT_CHANNEL_BAY_CMS.equals(request.getPaymentChannel())) {
                detailedErrorItemList.add(
                        new DetailedErrorItem("paymentChannel must be BAY_CMS when smartFinancialPaymentIndicator is true")
                );
            }
            if (ObjectUtils.isEmpty(request.getPresentmentEntryItems())) {
                detailedErrorItemList.add(
                        new DetailedErrorItem("presentmentEntryItems[] must be provided when smartFinancialPaymentIndicator is true")
                );
            } else {
                for (int i = 0; i < request.getPresentmentEntryItems().size(); i++) {
                    PresentmentEntryItemRequest presentmentEntry = request.getPresentmentEntryItems().get(i);
                    String prefixMessage = "presentmentEntryItems[" + i + "].";
                    if (StringUtils.isEmpty(presentmentEntry.getSellerIdentificationNumber())) {
                        detailedErrorItemList.add(
                                new DetailedErrorItem(prefixMessage + "sellerIdentificationNumber must be provided when smartFinancialPaymentIndicator is true")
                        );
                    }
                    if (StringUtils.isEmpty(presentmentEntry.getSellerBranchCode())) {
                        detailedErrorItemList.add(
                                new DetailedErrorItem(prefixMessage + "sellerBranchCode must be provided when smartFinancialPaymentIndicator is true")
                        );
                    }
                    if (StringUtils.isEmpty(presentmentEntry.getDocumentType())) {
                        detailedErrorItemList.add(
                                new DetailedErrorItem(prefixMessage + "documentType must be provided when smartFinancialPaymentIndicator is true")
                        );
                    }
                    if (StringUtils.isEmpty(presentmentEntry.getDocumentNumber())) {
                        detailedErrorItemList.add(
                                new DetailedErrorItem(prefixMessage + "documentNumber must be provided when smartFinancialPaymentIndicator is true")
                        );
                    }
                    if (StringUtils.isEmpty(presentmentEntry.getIssueDatetime())) {
                        detailedErrorItemList.add(
                                new DetailedErrorItem(prefixMessage + "issueDatetime must be provided when smartFinancialPaymentIndicator is true")
                        );
                    }
                }
            }
        }

        // 8.
        if (request.getPayerValidationIndicator() == null) {
            request.setPayerValidationIndicator(false);
        } else if (request.getPayerValidationIndicator()) {
            if (!PAYMENT_CHANNEL_BAY_CMS.equals(request.getPaymentChannel())) {
                detailedErrorItemList.add(
                        new DetailedErrorItem("paymentChannel must be BAY_CMS when payerValidationIndicator is true")
                );
            }
            if (!ObjectUtils.isEmpty(request.getReportingInformation())) {
                boolean isPayerAccountNumberNotEmpty = StringUtils.isNotEmpty(request.getReportingInformation().getPayerAccountNumber());
                boolean isPayerIdentificationNumberAndPayerTypeOfIdentificationNotEmpty = StringUtils.isNotEmpty(request.getReportingInformation().getPayerIdentificationNumber())
                        && StringUtils.isNotEmpty(request.getReportingInformation().getPayerTypeOfIdentification());
                if (!(isPayerAccountNumberNotEmpty || isPayerIdentificationNumberAndPayerTypeOfIdentificationNotEmpty)) {
                    detailedErrorItemList.add(
                            new DetailedErrorItem("payerAccountNumber must be provided or payerIdentificationNumber and payerTypeOfIdentification when payerValidationIndicator is true")
                    );
                }
            } else {
                detailedErrorItemList.add(
                        new DetailedErrorItem("reportingInformation must be provided when payerValidationIndicator is true")
                );
            }
        }

        if (detailedErrorItemList.size() != 0) {
            throw new InvalidInputException(INVALID_REQUEST_CODE, INVALID_REQUEST_MESSAGE, detailedErrorItemList);
        }

    }