[Home](./index.md) > [@digitalpersona/enrollment](./enrollment.md) > [TimeOtpEnroll](./enrollment.timeotpenroll.md) > [sendVerificationCode](./enrollment.timeotpenroll.sendverificationcode.md) ## TimeOtpEnroll.sendVerificationCode() method Sends an verification code using SMS to the user's device. Signature: ```typescript sendVerificationCode(key: Uint8Array, phoneNumber: string): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | key | Uint8Array | a secret key to "seed" an OTP generator and start generating verification codes. | | phoneNumber | string | a phone number to send a current verification code to. | Returns: `Promise`