---
updatedAt: 2025-09-08T20:07:22.000Z
agentTools:
  projectIndex: https://docs.fonoa.com/llms.txt
---

# Authentication

Fonoa API is protected by an in-built security and authentication mechanism of Subscription Key. A subscription key is usually referred as `Ocp-Apim-Subscription-Key` is required and needs to be passed for every request.

| Header                      | Description                                              | Demo API Key                                                            |
| :-------------------------- | :------------------------------------------------------- | :---------------------------------------------------------------------- |
| `Ocp-Apim-Subscription-Key` | Fonoa API Authentication key required for every request. | [Get in touch](https://www.fonoa.com/contact-sales?utm_source=API-docs) |