JackS

[wanton island]

what did you try exactly and what part didn't work? But yes using a schedule is the way to automate upgrading/downgrading the plan in the next cycle (https://stripe.com/docs/billing/subscriptions/subscription-schedules/use-cases#downgrading-subscriptions).

[silk sorrel]

I have been able to create different phases when creating a subscription schedule but I was receiving errors when trying to add a new phase when modifying the scheduel

Do I need to send the details of the existing phase as well as the new phase wanted when modifying?

[wanton island]

yes, exactly

that's the most common problem people have. You do need to include the current phase when doing an update(the API is 'declarative' in that you must declare the full state each time)