---
title: "Confirm a Backfill company match"
method: POST
path: "/backfill/companies/{companyId}/match"
tags: ["Backfill"]
---

# Confirm a Backfill company match

`POST /backfill/companies/{companyId}/match`

## Request

- Base URL: `https://api.cavuno.com/v1`
- URL: `https://api.cavuno.com/v1/backfill/companies/{companyId}/match`
- Auth: HTTP bearer

Link a needs_match company to a candidate by short-lived list index. The live candidate list is re-read and re-sorted server-side; a stale index returns `backfill_candidate_conflict`. Requires an `Idempotency-Key` header.

## Path parameters

- `companyId` string, required: Cavuno company ID from the companies or Backfill list.

## Request body

- MatchBackfillCompanyBody
  - `candidateIndex` integer, required: Zero-based index into the short-lived candidates array from list (needs_match). Re-validated server-side.
  - `start` boolean, required: When true, start backfill after linking the match; when false, only record the match (available).

## Response `200`

The company after match.

- BackfillCompany
  - `object` 'backfill_company', required
  - `companyId` string, required
  - `name` string, required
  - `website` string, nullable, required
  - `state` 'backfilling' | 'available' | 'needs_match' | 'not_backfilling', required
  - `candidates` BackfillMatchCandidate[]
    - `index` integer, required
    - `name` string, required
    - `website` string, nullable, required

## Other responses

- `default`: An error. Every non-2xx response uses the same envelope; see the Errors section of the introduction.

## Changes

- **2026-10-19** `c34152c38176`: 1 info
  - added the optional property `error/upgrade` to the response with the `default` status

[Operation history](https://skmtc.dev/cavuno/apis/cavuno-v1-rest-api/changes/backfill/companies/:companyId/match/post.md)

---

[API](https://skmtc.dev/cavuno/apis/cavuno-v1-rest-api.md) · [All operations](https://skmtc.dev/cavuno/apis/cavuno-v1-rest-api/llms.txt) · [OpenAPI document](https://skmtc.dev/cavuno/apis/cavuno-v1-rest-api/revisions/d5974dabff14?raw)