static CouponesProvider()
 {
     CouponesProvider.LoyalCustomerCoupone = new CouponeModel()
     {
         Name = "Loyal Customer",
         Value = 10,
         ValueType = CouponeValueType.Percent,
         Description = "10% намаление на всеки ненамален продукт",
         FreeShipping = true
     };
 }
        private async Task<bool> CanUseCoupon(CouponeModel coupone, string userId, FullOrderModel order)
        {
            if (coupone.Name == CouponesProvider.LoyalCustomerCoupone.Name)
            {
                using (ApplicationUserManager userManager = Startup.UserManagerFactory())
                {
                    bool canUseLoyalCustomerCoupon = await userManager.IsInRoleAsync(userId, "LoyalCustomer");

                    return canUseLoyalCustomerCoupon;
                }
            }

            return false;
        }