# 401 invalid_api_key

**Invalid API credential**

The API credential is missing, malformed, revoked, or unknown.

- HTTP status: 401
- Problem identifier (`type` field): `https://developer.noryo.app/errors/invalid_api_key`

[← Errors — Merchant API](https://developer.noryo.app/en-GB/errors)

---

Canonical page: https://developer.noryo.app/en-GB/errors/invalid_api_key