var employeeDetailsUploadResult = await _payrollPreviewProvider.SaveJoinerDetails(employeeDetailsUpload);
            var testError = new Error();

            var result = employeeDetailsUploadResult.FlatMap(res =>
            {
                return res.Match(
                some: edur =>
                {
                    var csiUploadResult = await _payrollPreviewProvider.SaveJoinerCSIs(csiKeysIntegrationModel);

                    csiUploadResult.Match(
                        some: cur =>
                        {
                            var addressUploadResult = await _payrollPreviewProvider.SaveEmployeeAddressIntegration(employeeDetailsUpload);

                            addressUploadResult.Match(
                                some: aur =>
                                {
                                    return model.SomeNotNull();
                                },
                                none: error =>
                                {
                                    testError.Messages = x.Error.Messages.ToList();
                                    return model.None(testError);
                                }
                                );
                        },
                        none: error =>
                        {
                            testError.Messages = x.Error.Messages.ToList();
                            return model.None(testError);
                        }
                        );
                },
                none: error =>
                {
                    testError.Messages = x.Error.Messages.ToList();
                    return model.None(testError);
                }
                );
            });

            return result;