Enable reCAPTCHA

Configure TypoScript constants

Configure constants with site key and secret. https://www.google.com/recaptcha/

plugin.tx_pxasurvey_survey {
  settings {
    recaptcha {
      siteKey =
      siteSecret =
    }
  }
}
constant_editor

Editor

Protect survey with reCAPTCHA

Don’t forget to enable reCAPTCHA protection in plugin settings