Stripe.StripeSubscriptionService.Update C# (CSharp) Method

        public virtual StripeSubscription Update(string customerId, string subscriptionId, StripeSubscriptionUpdateOptions updateOptions, StripeRequestOptions requestOptions = null)
        {
            var url = string.Format(Urls.Subscriptions + "/{1}", customerId, subscriptionId);

            return Mapper<StripeSubscription>.MapFromJson(
                Requestor.PostString(this.ApplyAllParameters(updateOptions, url, false),
                SetupRequestOptions(requestOptions))
            );
        }

        /// <summary>
        /// Changes the given subscription to use the new plan
        /// </summary>
        /// <param name="subscription"></param>
        /// <param name="newPlan"></param>
        public static void ChangeSubscriptionPlan(IStripeUser user, IStripeSubscription subscription, IStripeSubscriptionPlan newPlan)
        {
            StripeSubscriptionUpdateOptions options = new StripeSubscriptionUpdateOptions() { PlanId = newPlan.PaymentSystemId };

            var subscriptionService = new StripeSubscriptionService();
            subscriptionService.Update(user.PaymentSystemId, subscription.PaymentSystemId, options);

            System.Diagnostics.Trace.TraceInformation("Changed subscription for customer in stripe: '{0}' with new subscription id '{1}", user.Email, subscription.PaymentSystemId);
        }