Contract drops what was never sent

ChangelogAug 21, 2026Fixed

Several responses and one header were documented but never produced. They are gone from the contract, so a generated client no longer waits for them. Nothing about the server changes: it never sent them.

What else changed

X-Bulk-Failures is no longer documented on POST /v1/invoices/bulk/pdf or POST /v1/companies/{company_id}/invoices/pdf-archive. It never travelled: partial failures are reported in the response body, as they always were. If you read that header, you have been reading null all along.
Response codes that no operation could return are withdrawn — the 409 of POST /v1/invoices/{invoice_id}/corrective, the 400 of convert-to-invoice, and the error detail shapes documented for import-csv-preview that the server does not build. Every code an operation can answer stays declared, 429 and 500 included.
POST /v1/webhooks/{webhook_id}/test stops documenting a parameter it does not read.
Nothing here changes behaviour: no status code, body or header that you receive today is affected. What changes is that a client generated from the spec no longer has dead branches for responses that never arrive.

Endpoints

POST/v1/invoices/bulk/pdfX-Bulk-Failures header withdrawn from the contract; failures are in the body
POST/v1/companies/{company_id}/invoices/pdf-archiveX-Bulk-Failures header withdrawn from the contract; failures are in the body
POST/v1/invoices/{invoice_id}/corrective409 withdrawn: the operation does not answer it
POST/v1/webhooks/{webhook_id}/testUndocumented parameter withdrawn