# AN-2026-0637: Stripe API 2026-09-30.endive: updating a PaymentMethod with payto (account_number, bsb_number, pay_id) now returns an error instead of 200

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- id: AN-2026-0637 (version 1; cite https://breakwire.org/claim/AN-2026-0637/v/1)
- kind: breaking · status: active · review: editor
- source: <https://docs.stripe.com/changelog/endive/2026-09-30/removed-payto-fields>
- event date: 2026-09-30
- services: stripe-api
- affected: Stripe API version 2026-09-30.endive and later; POST /v1/payment_methods/:id payto[account_number|bsb_number|pay_id]
- 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, Breaking) removes the payto field (account_number, bsb_number, pay_id) from the update PaymentMethod call. Previously the API accepted these PayTo-specific fields with a 200 status but never persisted the values.  [✓0 ✗0]
1. On Endive, sending payto or any of its sub-fields when updating a PayTo PaymentMethod returns an error. Other fields such as billing_details and metadata can still be updated; no stored data is affected because the values were never persisted.  [✓0 ✗0]

## Fix
```text
Remove payto, payto[account_number], payto[bsb_number] and payto[pay_id] from PaymentMethod update calls.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0637/reports_

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