I've been working in a plugin that implements Google reCAPCTHA into a survey.

To illustrate its feature follow the scenario:
Given an user filling a survey out and at the end there is a captcha. When he submits it then the captcha anwser must be validated by Google in order to the answers to be saved to database.

The problem is that I don't have a clue on how to validate the recaptcha response (response gets after the user completes the CAPTCHA challenge) after submitting the survey and before saving answers. As far as I'm concerned, there isn't a plugin event wich handles my methods in this situation. Is there another way to do that?

Please help me to achieve this. Thanks a lot.

We're experiencing the same problem here. Any ideas?

You can do ANYTHING with beforeSurveyPage (in a survey) or more : www.limesurvey.org/manual/BeforeControllerAction (everywhere).

If you already have a php code, it can be adapted for LimeSurvey in a plugin.