Add CAPTCHA to a form with shortcode?

The method recaptcha_html on the main class returns the form html according to the plugin settings. So:

if ( class_exists(‘WP_reCaptcha’) )
add_shortcode( ‘recaptcha’ , array( WP_reCaptcha::instance() , ‘recaptcha_html’ ) );

would add a [recaptcha] shortcode.

Validating works through WP_reCaptcha::instance()->recaptcha_check();. It returns true when the captcha post parameter exists and is valid false otherwise.

Where to hook the validation process highly depends on the architecture of infusionsoft. I cannot go into this any deeper but when you found a solution which might be worth sharing, feel free to post it here or to contribute to plugin core code: https://github.com/mcguffin/wp-recaptcha-integration

cheers,
j?rn