---
title: "Check if a customer number is available"
method: GET
path: "/Contact/Mapper/checkCustomerNumberAvailability"
tags: ["Contact"]
---

# Check if a customer number is available

`GET /Contact/Mapper/checkCustomerNumberAvailability`

Checks if a given customer number is available or already used.

## Query parameters

- `customerNumber` string

## Response `200`

Returns whether given customer number is available.

- object
  - `objects` boolean

## Other responses

- `400` — Bad request
- `401` — Authentication required
- `500` — Server Error

---

[API](https://skmtc.net/sevdesk/apis/sevdesk-api.md) · [All operations](https://skmtc.net/sevdesk/apis/sevdesk-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/sevdesk/sevdesk-api/revisions/a32cec0fecea/schema)