[Home](./index.md) > [@firebase/auth-types](./auth-types.md) > [ConfirmationResult](./auth-types.confirmationresult.md) > [verificationId](./auth-types.confirmationresult.verificationid.md) ## ConfirmationResult.verificationId property The phone number authentication operation's verification ID. Signature: ```typescript readonly verificationId: string; ``` ## Remarks This can be used along with the verification code to initialize a [PhoneAuthCredential](./auth-types.phoneauthcredential.md).