# CallbackAuthentication

The CallbackAuthentication object contains Username, Password, and CertificateName parameters.

Parameter | Type | Description
--- | --- | ---
Username | string | A string of data containing the username. This parameter is optional; however, if providing a username, a password must be provided.
Password | string | A string of data containing the password. This parameter is optional.
CertificateName | string | A string of data containing the name of the Document Generation Services certificate. This parameter is optional; if not supplied, no certificate will be sent with the callback request.