I am trying to create a subscription with a specific subscriptionPeriod. However, when I try creating a sub, it gives me a 409 "The attribute 'subscriptionPeriod' can not be included in a 'CREATE' request". I have even tried creating a subscription and then updating it https://developer.apple.com/documentation/appstoreconnectapi/subscriptionupdaterequest. But i get the same error.
