What changed
A relaxation, not a break. Everything you could send before still works, and more is accepted now.
Affects POST /v1/subscriptions/{subscription_exposed_id}.
the documented value list is gone; more is accepted now
Who is affected
Code that sends POST /v1/subscriptions/{subscription_exposed_id} (billing_cycle_anchor).
Before and after
| Where | Before | After |
|---|---|---|
| POST /v1/subscriptions/{subscription_exposed_id} · billing_cycle_anchor | "now", "unchanged" | absent |
| POST /v1/subscriptions/{subscription}/resume · billing_cycle_anchor | "now", "unchanged" | absent |
Based on Stripe’s published API specification. How severity is decided.