A client authentication certificate is a digital certificate that verifies that you are a user in DigiCert ONE when you request to perform an action via the DigiCert ONE API. It allows applications to securely communicate with the API and DigiCert ONE client tools.
Instead of including your API key in the request header, you can specify the file path of your installed authentication certificate. However, some APIs may require both your API key and client authentication certificate.
Note
If your API key expires, is deleted, or is disabled, any API integrations using it will stop working.