# AN-2026-0138: Stripe livemode_mismatch: test and live keys, requests and objects only work within their own mode

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- id: AN-2026-0138 (version 1; cite https://breakwire.org/claim/AN-2026-0138/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://docs.stripe.com/error-codes#:~:text=livemode_mismatch>
- services: stripe-api
- severity: medium
- 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 error code livemode_mismatch: "Test and live mode API keys, requests, and objects are only available within the corresponding mode."  [✓0 ✗0]
1. Stripe API keys carry their mode in the prefix: sk_test_ (test) and sk_live_ (live).  [✓0 ✗0]

## Fix
```text
Use a key of the same mode as the object (sk_test_ for test objects, sk_live_ for live ones); do not mix a live publishable key with a test secret key, and recreate test fixtures in live mode instead of reusing their IDs.
```

## Error signatures
- code: `livemode_mismatch` (docs.stripe.com/error-codes)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0138/reports_

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