This step should happen after functional verification for two reasons.

这一步骤在验证功能之后执行，这样做有两个理由。

youdao

The registration process has two steps. Step I: Verification and confirmation of user name.

注册程序共分二步，这是第一步：验证并确定用户名。

youdao

From online check-outs to banking login screens, sites today use tools like captchas and two-step verification to confirm a consumer's identity.

如今，从在线退房到网银登陆，网站都可以用验证码和两步验证来确认用户的身份。

youdao

The documents also suggest that two-step verification may soon become less of an option, and more of a mandate.

ENGADGET

Gmail offers a two-step verification to add an extra layer of security.

CNN: Bush email hacking a wake up call

Two-step verification drastically reduces the chances of someone stealing the personal information from your e-mail account because hackers would have to not only get a password and your user name, they would also have to have access to the mobile phone to which the code is sent.

CNN: Bush email hacking a wake up call