> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/knowledge-hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/knowledge-hub/products/cc-software/configure/interface-options/api/representational-state-transfer-rest-api/rest-api-creating-the-client-certificate.md).

# REST API - creating the client certificate

Create and assign a client certificate for REST API authentication.

The client certificate lets Command Centre trust the caller. Create it on the PC that will connect to the REST API.

> ⚠️ On Windows, use PowerShell. `New-SelfSignedCertificate` is **not available on Windows 7**.

## Steps

1. Run **PowerShell** as Administrator.
2. Create the certificate:

   ```powershell
   New-SelfSignedCertificate -certstorelocation cert:\currentuser\my -dnsname GallagherRestClientCert
   ```

   This creates the certificate in **Current User → Personal → Certificates**.
3. Copy the **Thumbprint** from the certificate's **Details** tab, then paste it into the **Client Certificate Thumbprint** field of the REST Client (API Key tab).
4. Add **Network Service** permission to the certificate.

***

🔗 **Related**

* [REST API - Certificates](/knowledge-hub/products/cc-software/configure/interface-options/api/representational-state-transfer-rest-api/rest-api-certificates.md). How client and server trust fit together.
* [REST API - Setting up REST API in Command Center](/knowledge-hub/products/cc-software/configure/interface-options/api/representational-state-transfer-rest-api/rest-api-setting-up-rest-api-in-command-center.md). Where the thumbprint is pinned.


---

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