Stripe subscription schedule update with API

[momomonet]

Hi,
I’m using API connector with Stripe API to create a monthly subscription of 6 or 12 months.
I managed to create the checkout session with mode=subscription and it works well, monthly subscription is well active.
Now i want to update the subscription schedule to give it an end by setting phase iterations to 6 or 12.

1. i get the subscription schedule from the created subscription:
   

   

2. i try to update that schedule but get 2 contradictory error messages while setting phases[0][start_date] or missing it:
   

   

Does anyone have any idea please?
Thanks
Morgan

[momomonet]

Using dynamic value for start_date should work in my WF.