reCAPTCHA v3 - parameter "g-recaptcha-response" is null

[Gil]

Dear all

I'm trying to use recaptcha v3 in a JAVA project.

JSP

<script type="text/javascript" src="https://www.google.com/recaptcha/api.js?render=<reCAPTCHA_site_key>"></script>
...
<script>
    grecaptcha.ready(function() {
        grecaptcha.execute('<reCAPTCHA_site_key>')
            .then(function(token) {
                alert(token); -> the token is printed!
            });
    });
</script>
...

What is the best way to validate the token (server side) after the user submits the form?
In reCAPTCHA v2.0 the value of "g-recaptcha-response" are passed to website backend to validate the recaptcha.  

Thanks

[Phelix Downs]

The reCaptcha issue is very important and complex for the safety of information for potential users.  Thank you for the script clarification.  I will keep you posted once the issue is rectified. 

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