//inject the services
public BaseService(IGiftVoucherService giftService, IDiscountVoucherService discountService,
IValueVoucherService valueService, IVoucherRepository voucherRepository, ILogger <BaseService> logger)
{
this._giftVoucherService = giftService;
this._discountVoucherService = discountService;
this._valueVoucherService = valueService;
this._baseRepository = voucherRepository;
this._logger = logger;
}
