public Task CreatePromotionAsync(string product, string storeId, int discount, CancellationToken ct = default(CancellationToken))
        {
            var promotion = new Promotion()
            {
                Id = DateTime.Now.ToString("yyyyMMddHHmmss"),
                Product = product,
                Discount = discount,
                StoreId = storeId
            };

            return CreatePromotionAsync(promotion, ct);
        }
 public Task CreatePromotionAsync(Promotion promotion, CancellationToken ct = default(CancellationToken))
 {
     return _bootcampService.PostAsync("promotions", promotion, ct);
 }