public static async Task CreateCoupon(string bookId) { var coupon = new CouponForCreation { coupon_code = "test1234", start_date = DateTime.Now.Date, end_date = DateTime.Now.AddYears(1).Date, max_uses = 1, discounted_price = 0.0, suspended = false, note = string.Empty }; if (await apiClient.CreateCouponAsync(bookId, coupon)) { Console.WriteLine($"Coupon created: {coupon.coupon_code}"); } }