coding an extension to Contact Form 7

Having a user click a link that verifies their email address seems to be lacking. I can’t find the functionality anywhere. So I decided to give it a go to code it up.

I’ve started here https://github.com/magician11/wpcf7-email-verification

As I’m coding it, I realise I could probably re-use some of the Contact Form 7 code. Is there is an API or some documentation for this?

For example, to retrieve the posted_data for the sender’s email address I’ve written this little function..

function wpcf7ev_get_senders_email_address($wpcf7_form)
{
    // grab sender info
    $senderTags = $wpcf7_form->mail['sender'];

    // replace tag names with posted_data using regex
    return $sendersEmailAddress = preg_replace_callback('/\[(.+?)\]/',
                                 function ($matches) use ($wpcf7_form)
                                 {
                                     return $wpcf7_form->posted_data[$matches[1]];
                                 },
                                 $senderTags
                                 );
}

But this function (with probably error catching code) must already be in the core code of Contact Form 7?

Any suggestions/feedback?

Thanks.

http://wordpress.org/plugins/contact-form-7/