by Rafal Puczel of RFS WP on WordPress.org
OTP (One Time Password) Email Verification for Gravity Forms. Verify or authenticate your users. It’s also great way to avoid spam.

Single page form - before sending code.
This plugins is an add-on for Gravity Forms. Requires Gravity Form plugin to work.
RFS Email Verification for Gravity Forms adds and OTP (One Time Password) email verification functionality to your form. It allows you to easily verify or athenticate your users / customers / clients. The unique code is sent to a user’s email address and needs to be entered in order to submit the form. It’s also great way to avoid spam users submitting your forms. It supports both single and multi-page forms.
The addon includes custom hooks and filters. You can find the details in plugin Documentation
Do you speak another language? Want to contribute in a meaningful way to our plugin? Contact us if you’d like to help translating the plugin into your language.
Having issues with the plugin? Contact us through the website.