Knetik.Cart.QuickPurchase C# (CSharp) Method

        public void QuickPurchase(CatalogSku sku, Action<KnetikResult<Cart>> cb)
        {
            Client.CartGet((res) => {
                if (res.IsSuccess) {
                    KnetikJSONNode existingItems = res.Body["result"]["items"];
                    foreach (KnetikJSONNode json in existingItems.Children) {
                        Client.CartModify(json["catalog_id"].AsInt, json["sku_id"].AsInt, 0);
                    }
                }

                Client.CartAdd(sku.CatalogID, sku.ID, 1, (addResponse) => {
                    var result = new KnetikResult<Cart> {
                        Response = addResponse
                    };
                    if (!addResponse.IsSuccess) {
                        cb(result);
                        return;
                    }

                    Client.CartCheckout((checkoutResponse) => {
                        result.Response = checkoutResponse;

                        if (!checkoutResponse.IsSuccess) {
                            cb(result);
                            return;
                        }

                        result.Value = this;
                        cb(result);
                    });
                });
            });
        }