Validate user's email before using portal functionality

Hi ,

To avoid submitting false request using portal, can it possible to verify users email or phone before using the portal's functionality?

Here is the scenario,

Step 1 . When an user access the portal, user will enter the email address,

Step 2.  Appian will send an email to the person's provided email with verification link. 

Step 2. User will go to his email and click on verification email.

Step 3. User will log in to portal and enter the email, as the email is verified, a request form will appear where the user can submit his request.

I am not sure if Url parameter can be used here. Has anyone used such use case? Can you please share your ideas?

Regards,

Surjit