Add product to kolonial cart

AddProductToCartAsync.csx

public static async Task AddProductToCartAsync(HttpClient httpClient, KolonialProduct kolonialProduct, TraceWriter log)
{
    var productsJson = JsonConvert.SerializeObject(
                new { items = new []{ new { product_id = kolonialProduct.Id, quantity = 1 } }});
    log.Info($"Updating Kolonial with {productsJson}");
    var response = await httpClient.PostAsync(
        "https://kolonial.no/api/v1/cart/items/",
        new StringContent(productsJson, Encoding.UTF8, "application/json"));
    response.EnsureSuccessStatusCode();
}