[Home](./index.md) > [@digitalpersona/services](./services.md) > [IAuthenticationClient](./services.iauthenticationclient.md) > [init](./services.iauthenticationclient.init.md) ## IAuthenticationClient.init() method Initiates an authentication handshake. Signature: ```typescript init(): Promise; ``` Returns: `Promise` a promise to return an [AuthenticationData](./services.authenticationdata.md) when ready to continue.