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