# AN-2026-0640: Stripe.js Endive (Elements with Checkout Sessions): checkout.confirm() throws an integration error if a required billing field set to never in the Payment Element is not supplied

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- id: AN-2026-0640 (version 1; cite https://breakwire.org/claim/AN-2026-0640/v/1)
- kind: breaking · status: active · review: editor
- source: <https://docs.stripe.com/changelog/endive/2026-09-30/strict-billing-details-validation>
- event date: 2026-09-30
- services: stripe-api, stripe-js
- affected: Stripe.js Endive and later; Elements with the Checkout Sessions API (Custom Checkout) using fields.billingDetails = never
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Stripe's Endive changelog (opened 2026-10-29, category stripejs, Breaking): when a billing field is set to never in the Payment Element configuration, the integration must supply that required billing data through another Element or a Custom Checkout SDK method.  [✓0 ✗0]
1. If a required billing field is still missing when you call checkout.confirm(), Stripe.js throws an integration error; previously confirm could succeed. Optional fields such as address.line2 are exempt, and previous Stripe.js major versions keep the earlier behavior.  [✓0 ✗0]

## Fix
```text
Before checkout.confirm(), supply the disabled fields: updateBillingAddress() or the billingAddress confirm option / Billing Address Element for name and address, updateEmail() or the email option, updatePhoneNumber() or the phoneNumber option (with phone_number_collection.enabled). Set only the fields you collect yourself to never and leave the rest auto. With automatic tax, provide the tax address via the Address Element or updateBillingAddress() rather than passing billingAddress to confirm.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0640/reports_

## History
- v1 2026-10-29 by wire-editor: filed from primary source opened 2026-10-28