​

Enrolling users in MFA

Once you have enabled MFA for your app, to prompt your users to enroll in MFA for their embedded wallet, use the showMfaEnrollmentModal method from the useMfaEnrollment hook.

import {useMfaEnrollment} from '@privy-io/react-auth';

function MfaEnrollmentButton() {
  const {showMfaEnrollmentModal} = useMfaEnrollment();
  return <button onClick={showMfaEnrollmentModal}>Enroll in MFA</button>;
}

When invoked, will open a Privy modal that prompts the user to select their desired MFA method from the ones you’ve enabled for your app, and will guide them through the enrollment process.

Once a user has successfully enrolled an MFA method, the user’s enrolled method will appear under the field of their object:

const {user} = usePrivy();
console.log(user.mfaMethods);
// ['sms', 'totp', 'passkey'] for a user who has enrolled in all of SMS, TOTP, and passkey MFA

​

Managing MFA methods

To allow your users to modify their MFA methods, simply invoke the showMfaEnrollmentModal method from the useMfaEnrollment hook. This is the same method you would use to prompt your user to enroll in MFA for the first time.

Within this modal, users can remove existing MFA methods or enroll in additional ones for their embedded wallet. Prior to making changes to their MFA methods, users will be prompted to re-verify their identity using one of their existing MFA methods.

<PrivyProvider
  appId="your-privy-app-id"
  config={{
    ...theRestOfYourConfig,
    passkeys: {
      // Set this to `false` if you wish to keep the passkey as a login method after unenrolling from MFA.
      shouldUnlinkOnUnenrollMfa: false,
    },
  }}
>
  {/* your app's content */}
</PrivyProvider>

​

Authorizing signatures and transactions

Once a user has enrolled in MFA, every attempt to use the wallet’s private key (every signature or transaction) will require the user to complete MFA using their method. This logic is automatic; you do not need to do anything else once your user has enrolled in wallet MFA.

When your app requests a signature or a transaction from the embedded wallet, Privy will show the user a modal prompting them to enter a 6-digit MFA code sent to their MFA method. If the user has enrolled in multiple MFA methods, they can choose which method they’d like to use for this given request.

Users must enter their MFA code within 5 minutes of receiving it, and are allowed up to a maximum of 4 code attempts if they incorrectly enter their code.

If the user correctly enters their MFA code, the signature or transaction request will be processed by the wallet. Additionally, their MFA verification status will be cached for 15 minutes. This means that for additional signatures or transactions requested within this window, Privy will not prompt the user to re-complete MFA.

If the user does not complete MFA or enters in an incorrect code 4 times or more, the signature or transaction will raise an error as if the user rejected the request.

​

Setting up MFA UIs in React Native

Once you’ve set up PrivyElements, you can use Privy’s default UIs to enroll your users in MFA and prompt them for MFA during wallet actions.

​

MFA enrollment

Privy’s default UIs for React Native can also be used for allowing your users to enroll their first MFA verification method, or any number of additional ones.

For this, use the useMfaEnrollmentUI hook to get an init method, that you can use to launch the flow. This method takes in a configuration object with the following fields:

import {useMfaEnrollmentUI} from '@privy-io/expo/ui';

export function EnrollMFAMethodButton() {
  const {init: initMfaEnrollmentUI} = useMfaEnrollmentUI();

  const onEnrollMfa = async () => {
    try {
      await initMfaEnrollmentUI({mfaMethods: ['sms', 'totp', 'passkey']});
      // Your code on actions to execute after successful mfa enrollment
    } catch (error) {
      // Your code on cancelled or otherwise unsuccessful mfa enrollment
    }
  };

  return <Button onPress={onEnrollMfa}>Enroll an MFA method</Button>;
}

​

Passkey unenrollment

Using the MFA enrollment UIs means users will also be able to unenroll a method they had previously set up too.

For passkeys, the default behavior when unenrolling is that the passkey is also removed as a valid login method.

You can change this behavior in the MFA UIs, by setting the shouldUnlinkOnUnenrollMfa option in the PrivyElements component:

import {PrivyElements} from '@privy-io/expo/ui';

export default function RootLayout() {
  return (
    <>
      {/* Your app's content */}
      <PrivyElements config={{passkeys: {shouldUnlinkOnUnenrollMfa: false}}} />
    </>
  );
}

​

MFA verification

Privy’s default UIs for React Native can be used for your users to verify their already set MFA methods, such as SMS or passkeys.

To do this, you must enable the enableMfaVerificationUIs option on the PrivyElements component:

import {PrivyElements} from '@privy-io/expo/ui';

export default function RootLayout() {
  return (
    <>
      {/* Your app's content */}
      <PrivyElements config={{mfa: {enableMfaVerificationUIs: true}}} />
    </>
  );
}

After doing this, all operations you do on the wallet (such as signing messages or preparing transactions) will automatically trigger the MFA UIs if MFA verification is required at that moment.