[Home](./index.md) > [@digitalpersona/authentication](./authentication.md) > [ContactlessCardAuth](./authentication.contactlesscardauth.md) > [(constructor)](./authentication.contactlesscardauth.(constructor).md) ## ContactlessCardAuth.(constructor) Constructs a new contactless authentication API object. Signature: ```typescript constructor(authService: IAuthService); ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | authService | IAuthService | an connected to the server. |