Subscription modification endpoints now support an optional boolean parameter: allow_invoice_credit_or_void.

    •    Defaults to True (maintains existing behavior).

    •    Set to False to prevent modifications that would create a credit note or void an invoice. Instead, such requests will fail with a validation error.

When to use this

Certain modifications, like canceling a subscription mid-period with an in-advance fixed fee, typically generate credit notes. If you’re confident your modifications shouldn’t create these, set allow_invoice_credit_or_void=False as a safeguard.

Equivalent to a Dry-Run

This functions similarly to sending a dry-run request and previewing changes first, which allows for more precise validation of side effects.

Supported Endpoints

 - Cancel subscription

- Add or edit price intervals

- Trigger phase

- Update price quantity