WP_Members_Captcha

/**
 * To display a captcha, use the show() method passing both the 
 * captcha type (see docs) and your public api key. The method
 * returns a string that you can either append to your form 
 * string or echo/print, depending on what hook you are using
 * to display it.
 */
 $html = WP_Members_Captcha::show( $type, $public_key );
 
 
 /**
  * To validate a captcha upon form submission, use the validate()
  * method passing both the captcha type (see docs) and your 
  * private/secret api key. This returns a true|false boolean.
  */
 $passed = WP_Members_Captcha::validate( $type, $private_key );