---
title: "GET /invoice/validate-number"
method: GET
path: "/invoice/validate-number"
---

# GET /invoice/validate-number

`GET /invoice/validate-number`

Check whether an invoice number is available (not already in use) for your legal entity.

## Query parameters

- `filter:legalEntityId` string
- `invoiceNumber` string, required

## Response `200`

OK

- object
  - `isAvailable` boolean, required — Whether the invoice number is available for use.

## Other responses

- `401` — Unauthorized
- `403` — Forbidden
- `429` — TooManyRequests
- `500` — Internal Error

---

[API](https://skmtc.net/slashfi/apis/slash-public-api.md) · [All operations](https://skmtc.net/slashfi/apis/slash-public-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/slashfi/slash-public-api/versions/773c90f079c5/schema)