To enable two-step authentication using text messaging (SMS), go to your user profile and click "Add" under the Two-step authentication section. Add your phone number and confirm it with the unique verification code sent to you. Store the backup code provided in a safe place, and Stripe will request a code for new devices and periodically for security.

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1. Go to your user profile.
2. Click Add under the Two-step authentication section.
3. Select Add SMS. You will be asked to enter your phone number. Enter your phone number and click Confirm phone number.

4. You will be sent a unique verification code to confirm that we’ve got the right phone number. Note that it may take a minute or two to receive your verification code.
5. Write down the backup code shown and store it in a safe place.

The setup process is then complete. Going forward, Stripe will request a code if you sign in from a new device, as well as periodically to make sure it’s still secure.