I have the same issue as reported here but with the dotnet SDK. I am trying to follow the Docs to include the current Phase, to try to end it imedately and adding the next phase, but I always get the error:

'You can not update a phase that has already ended. Trying to update phase 0.',

if (stripeSubscription.Schedule != null) {
    if (stripeSubscription.Schedule.CurrentPhase != null) {
        var currentPhase = stripeSubscription.Schedule.Phases.First(p => p.StartDate == stripeSubscription.Schedule.CurrentPhase.StartDate && p.EndDate == stripeSubscription.Schedule.CurrentPhase.EndDate);

        phases.Add(new SubscriptionSchedulePhaseOptions() {
            Items = [.. currentPhase!.Items!.Select(
                i => new SubscriptionSchedulePhaseItemOptions() {
                    Price = i.PriceId,
                    Quantity = i.Quantity
                }).ToList()
            ],
            Discounts = [.. currentPhase.Discounts.Select(d => new SubscriptionSchedulePhaseDiscountOptions{
                Coupon = d.CouponId                        
            })],
            Metadata = currentPhase.Metadata,
            StartDate = currentPhase.StartDate,
            EndDate = SubscriptionSchedulePhaseEndDate.Now
        });
        initialPhases[0].StartDate =  SubscriptionSchedulePhaseStartDate.Now;
    }

    phases.AddRange(initialPhases);

I have the same issue as reported here but with the dotnet SDK. I am trying to follow the Docs to include the current Phase, to try to end it imedately and adding the next phase, but I always get the error:

'You can not update a phase that has already ended. Trying to update phase 0.',

if (stripeSubscription.Schedule != null) {
    if (stripeSubscription.Schedule.CurrentPhase != null) {
        var currentPhase = stripeSubscription.Schedule.Phases.First(p => p.StartDate == stripeSubscription.Schedule.CurrentPhase.StartDate && p.EndDate == stripeSubscription.Schedule.CurrentPhase.EndDate);

        phases.Add(new SubscriptionSchedulePhaseOptions() {
            Items = [.. currentPhase!.Items!.Select(
                i => new SubscriptionSchedulePhaseItemOptions() {
                    Price = i.PriceId,
                    Quantity = i.Quantity
                }).ToList()
            ],
            Discounts = [.. currentPhase.Discounts.Select(d => new SubscriptionSchedulePhaseDiscountOptions{
                Coupon = d.CouponId                        
            })],
            Metadata = currentPhase.Metadata,
            StartDate = currentPhase.StartDate,
            EndDate = SubscriptionSchedulePhaseEndDate.Now
        });
        initialPhases[0].StartDate =  SubscriptionSchedulePhaseStartDate.Now;
    }

    phases.AddRange(initialPhases);

• c#
• stripe-payments

1 Answer 1

If you examine your request logs, is the payload for phases as you expect? If the first phase is already over, then it should be omitted instead.

It's not clear what initialPhases contains aside from the 0th start date you override.

Likely you will need to provide a concrete example request (eg, req_12345) and work with Stripe Support to help you out here if there are not outward obvious issues.