public async Task <RegisterTenantOutput> RegisterTenant(RegisterTenantInput input)
        {
            if (input.EditionId.HasValue)
            {
                await CheckEditionSubscriptionAsync(input.EditionId.Value, input.SubscriptionStartType);
            }
            else
            {
                await CheckRegistrationWithoutEdition();
            }

            using (CurrentUnitOfWork.SetTenantId(null))
            {
                CheckTenantRegistrationIsEnabled();

                if (UseCaptchaOnRegistration())
                {
                    await _recaptchaValidator.ValidateAsync(input.CaptchaResponse);
                }

                //Getting host-specific settings
                var isActive = await IsNewRegisteredTenantActiveByDefault(input.SubscriptionStartType);

                var isEmailConfirmationRequired = await SettingManager.GetSettingValueForApplicationAsync <bool>(
                    AbpZeroSettingNames.UserManagement.IsEmailConfirmationRequiredForLogin
                    );

                DateTime?subscriptionEndDate = null;
                var      isInTrialPeriod     = false;

                if (input.EditionId.HasValue)
                {
                    isInTrialPeriod = input.SubscriptionStartType == SubscriptionStartType.Trial;

                    if (isInTrialPeriod)
                    {
                        var edition = (SubscribableEdition)await _editionManager.GetByIdAsync(input.EditionId.Value);

                        subscriptionEndDate = Clock.Now.AddDays(edition.TrialDayCount ?? 0);
                    }
                }

                var tenantId = await _tenantManager.CreateWithAdminUserAsync(
                    input.TenancyName,
                    input.Name,
                    input.AdminPassword,
                    input.AdminEmailAddress,
                    null,
                    isActive,
                    input.EditionId,
                    shouldChangePasswordOnNextLogin : false,
                    sendActivationEmail : true,
                    subscriptionEndDate,
                    isInTrialPeriod,
                    AppUrlService.CreateEmailActivationUrlFormat(input.TenancyName)
                    );

                var tenant = await TenantManager.GetByIdAsync(tenantId);

                await _appNotifier.NewTenantRegisteredAsync(tenant);

                return(new RegisterTenantOutput
                {
                    TenantId = tenant.Id,
                    TenancyName = input.TenancyName,
                    Name = input.Name,
                    UserName = AbpUserBase.AdminUserName,
                    EmailAddress = input.AdminEmailAddress,
                    IsActive = tenant.IsActive,
                    IsEmailConfirmationRequired = isEmailConfirmationRequired,
                    IsTenantActive = tenant.IsActive
                });
            }
        }