                        </td>
                        <td>Optional. If your form contains a reCAPTCHA widget, or uses invisible reCAPTCHA, place your secret key here. See <a href="js-recaptcha-v2.html" target="_blank">reCAPTCHA documentation</a> for more detail.</td>
                      </tr>
                      <tr>
                        <td><code>$recaptchaErrorMessage</code>
                        </td>
                        <td>Optional. If using reCAPTCHA, this is an explanation to the user fo