Can you recommend any two factor authentication service to use in conjunction with jotform

Can you recommend any two factor authentication service to use in conjunction with jotform

We do not allow log in forms to be created using JotForm.  Adding username of password fields to a form will result in the account being suspended by our phishing detector. 

If you are looking for some other form of two factor authentication, let us know a bit more detail and we will be happy to see what we can do.

I am looking for a way to let me know people signing up using my form are real people. So I was just asking is there a service that offers that functionality that can connect with jotform forms.

You can use the following methods:

By widget: 

1. Add Google Recaptcha http://widgets.jotform.com/widget/google_recaptcha. Will prevent bots.

2. Email Validator http://widgets.jotform.com/widget/e-mail_validator. Will require people to verify their email before they can submit the form.

3. SMS Confirmation, requires Twilio Account http://widgets.jotform.com/widget/sms_confirmation. Will require people to confirm by text/call before they can submit the form.

By apps:

1. Submissions Verified http://apps.jotform.com/app/submission_verifier. Will require people to verify their submission before you'll receive it.