Check whether a candidate PO already carries a logical duplicate

GET 
/invoices/:code/duplicate-check

Read-only Layer 2 comparison of an invoice against a candidate PO. Flag-gated; returns negative when the invoice_duplicate_guard flag is off for the tenant. No side effects. Object-level authorization applies: a caller who may not access the invoice is masked as 404, mirroring the matching read endpoints.

Request

Responses

200

OK

400

Invalid request

401

Unauthorized

403

Forbidden - request denied by authorization, or blocked by the API firewall

404

Invoice or PO not found (or not accessible)

429

Too many requests - rate limited by the API firewall; wait out the Retry-After delay before retrying

Response Headers

Retry-After

Delay in seconds a client must wait before retrying the request

500

Internal server error