[Home](./index.md) > [@digitalpersona/services](./services.md) > [AuthenticationData](./services.authenticationdata.md) ## AuthenticationData class Client-side authentication data used by the [IAuthenticationClient](./services.iauthenticationclient.md) during authentication handshake. Signature: ```typescript export declare class AuthenticationData ``` ## Properties | Property | Modifiers | Type | Description | | --- | --- | --- | --- | | [data](./services.authenticationdata.data.md) | | string | Client's authentication data to pass to the server. | | [handle](./services.authenticationdata.handle.md) | | AuthenticationHandle | An authentication handle. The client must create the handle on [IAuthenticationClient.init()](./services.iauthenticationclient.init.md), and destroy on . |