credit_note_already_issued

HTTP 409§9.6 Calls, analytics, billing, and exports

The same route against an invoice that already carries a credit note in the credit_notes mirror. The route is a re-attempt, not an issuer - the invoice.finalized webhook handler is the issuer - and Stripe permits credit notes summing to the invoice total, so an unguarded second press is representable at Stripe and would over-credit. What an operator does: nothing; the comp landed.

Problem shape

Every non-2xx response is an RFC 9457 application/problem+json body. The type URI below is stable and machine-matchable, so branch on the final path segment (the code) and treat the status as redundant confirmation. See the error-handling guide.

{
  "type": "https://docs.vocapable.com/errors/credit_note_already_issued",
  "title": "…",
  "status": 409,
  "detail": "…",
  "instance": "/v1/…"
}

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