create div in html with attr

class="js_google_recaptcha_item"
id="your_random_unique_ID"
data-callback="yourCallbackFunc"
data-size="invisible"

$options = array( 'hideBadge' => false, 'dataBadge' => 'bottomright', 'timeout' => 5, 'debug' => false );

$captcha = new Riddman\MultiRecaptcha\Recaptcha(CAPTCHA_SITE_KEY, CAPTCHA_SECRET_KEY, $options);

yourCallbackFunc = function() {

    // your code
};

echo captcha()->multiCaptchaRender();

$captcha->verifyResponse($_POST['g-recaptcha-response'], '');