BasketController.cs

 [HttpPost("UpdateBasketItems")]
    public async Task<Basket.Api.Models.Basket?> UpdateBasketItems(Basket.Api.Models.Basket basket)
    {

        using var channel = GrpcChannel.ForAddress(_configuration.GetValue<string>("DiscountGrpcServerUrl"));
        var client = new Price.PriceClient(channel);
        foreach (var item in basket.BasketItems)
        {
            var reply = await client.GetPriceAsync(new PriceRequest() { Id = item.ProductId });
            if (!string.IsNullOrEmpty(reply.ErrorMessage))
            {
                throw new Exception("Price Undefined");
            }
            item.Price = reply.CurrentAmount;
        }


        await _rediscache.SetStringAsync(basket.UserName, JsonSerializer.Serialize(basket));

        return JsonSerializer.Deserialize<Basket.Api.Models.Basket>(await _rediscache.GetStringAsync(basket.UserName));

    }