Unifies the billing cycle anchor format across Subscriptions and Invoices
Unifies how updates to a subscription’s billing cycle anchor are formatted when updating Subscriptions, resuming Subscriptions, and creating Preview Invoices. The billing_cycle_anchor field now uses a consistent object format with a type field, replacing the previous string, enum, and timestamp formats. The billing_cycle_anchor field now requires an object with a type field instead of a string value (for example, {type: 'now'}). When creating a preview invoice, the subscription_details.billing_cycle_anchor field requires an object with type and timestamp fields.
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| [Unifies the billing cycle anchor format across Subscriptions and Invoices](https://docs.stripe.com/changelog/endive/2026-09-30/polymorphic-billing-cycle-anchor.md) | Billing | Breaking | api |
Also readmatches the page ✓
The `billing_cycle_anchor` field now requires an object with a `type` field instead of a string value (for example, `{type: 'now'}`). When creating a preview invoice, the [subscription_details.billing_cycle_anchor](https://docs.stripe.com/api/invoices/create_preview.md?api-version=2026-09-30.endive#create_invoice-subscription_details-billing_cycle_anchor) field requires an object with `type` and `timestamp` fields.
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