[Home](./index.md) > [@digitalpersona/enrollment](./enrollment.md) > [TimeOtpEnroll](./enrollment.timeotpenroll.md) > [enrollHardwareOtp](./enrollment.timeotpenroll.enrollhardwareotp.md) ## TimeOtpEnroll.enrollHardwareOtp() method Enrolls a hardware TOTP token. Signature: ```typescript enrollHardwareOtp(code: string, serialNumber: string, counter?: string, timer?: string): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | code | string | a verification code entered by a user. | | serialNumber | string | a serial number of the TOTP token. | | counter | string | an optional counter displayed on some token models. | | timer | string | an optional timer displayed on some token models | Returns: `Promise` a promise to perform the enrollment or reject in case of an error.